DATAKEY INC
S-3, 1998-06-12
MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES
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           As filed with the Securities and Exchange Commission on June 12, 1998
                                                      Registration No. 333-_____

================================================================================

                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-3
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                                  DATAKEY, INC.
                (Name of Registrant as specified in its Charter)
              Minnesota                                           41-1291472
   (State or other Jurisdiction of                             (I.R.S. Employer
    Incorporation or Organization)                        Identification Number)
                                  Datakey, Inc.
                            407 West Travelers Trail
                           Burnsville, Minnesota 55337
                                 (612) 890-6850
   (Address and Telephone Number of Registrant's Principal Executive Offices)

    -----------------------------------------------------------------------
                               Alan G. Shuler, CFO
                                  Datakey, Inc.
                            407 West Travelers Trail
                           Burnsville, Minnesota 55337
                                 (612) 890-6850
            (Name, Address and Telephone Number of Agent for Service)

                                   Copies to:
                         Elizabeth McGraw Reiskytl, Esq.
                            Fredrikson & Byron, P.A.
                       900 Second Avenue South, Suite 1100
                          Minneapolis, Minnesota 55402
                                 (612) 347-7000

         Approximate  date of commencement of proposed sale to the public:  From
time  to time  after  the  effective  date of  this  Registration  Statement  as
determined by market  conditions  and other factors and as Selling  Shareholders
shall determine.
         If the only securities  being registered on this form are being offered
pursuant to dividend or interest  reinvestment plans, please check the following
box: [ ]
         If any of the securities being registered on this form to be offered on
a delayed or continuous basis,  pursuant to Rule 415 under the Securities Act of
1933, check the following box: [X]
         If this Form is filed to register additional  securities of an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list  the  Securities  Act  registration  statement  number  of the  earlier
effective registration statement for the same offering: [ ]
         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(c) under the  Securities  Act,  please check the  following box and list the
Securities  Act  registration   statement   number  of  the  earlier   effective
registration statement for the same offering: [ ]
         If delivery of the  prospectus  is expected to be made pursuant to Rule
434, please check the following box: [ ]
<TABLE>
<CAPTION>

                         CALCULATION OF REGISTRATION FEE
- -----------------------------------------------------------------------------------------------------------------
     Title of Each                                Proposed Maximum        Proposed Maximum
  Class of Securities        Amount to be          Offering Price        Aggregate Offering          Amount of
   to be Registered           Registered              per Unit                 Price             Registration Fee
<S>                          <C>                        <C>                 <C>                      <C>      
   Common Stock (par         670,149 shares(1)(2)       $5.59(3)            $3,746,132.91(3)         $1,105.11
value $0.05 per share)
   Common Stock (par         225,985 shares(4)          $5.59               $1,263,256.15            $  372.66
value $0.05 per share)
   TOTAL                     896,134  shares                                                         $1,477.77
- ------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  Represents  the  maximum  number of shares of Common  Stock  issuable  upon
conversion  of  the  Series  A  Convertible   Cumulative  Preferred  Stock  (the
"Preferred  Stock")  and the  payment of  dividends  in shares of Common  Stock,
assuming a conversion price of $2.75.

(2)  Pursuant to Rule 416 under the Act,  included in this  registration  are an
indeterminate  number of  additional  shares of Common  Stock as may be issuable
upon (i) conversion of the shares of the Preferred  Stock  described  herein and
(ii) payment of dividends  thereon in additional shares of Common Stock pursuant
to the anti-dilution and other provisions of such Preferred Stock.

(3) Estimated  solely for the purpose of  calculating  the  registration  fee in
accordance  with Rule 457(c) under the Securities Act of 1933, as amended,  (the
"Act") and based upon the average of the high and low sale prices for such stock
on June 11, 1998, as reported by the Nasdaq National Market.

(4)  Represents  shares  issuable to Selling  Shareholders  upon the exercise of
warrants and then offered for resale  pursuant to this  registration,  including
warrants to purchase  188,095 shares at $6.30 per share and warrants to purchase
37,890 shares at $6.60 per share.

The Registrant hereby amends this  Registration  Statement on such date or dates
as may be necessary to delay its effective date until the Registrant  shall file
a further amendment which specifically  states that this Registration  Statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities Act of 1933, as amended,  or until this Registration  Statement shall
become effective on such date as the  Commissions,  acting pursuant to aforesaid
Section 8(a), may determine.


<PAGE>

                                   PROSPECTUS

                                  DATAKEY, INC.

                         896,134 SHARES OF COMMON STOCK


         This  Prospectus  relates to the offer and sale of up to 896,134 shares
of Common Stock (the "Shares"),  par value $.05 per share,  of Datakey,  Inc., a
Minnesota corporation (the "Company" or "Datakey"), that may be offered and sold
from  time  to  time  by  the  shareholders   described  herein  under  "Selling
Shareholders" (the "Selling Shareholders") or by pledgees, donees,  transferees,
or  other   successors   in  interest  that  receive  such  shares  as  a  gift,
distribution,  or other non-sale related transfer.  The Selling Shareholders may
become  holders of the Company's  Common Stock upon  conversion  of  outstanding
shares  of Series A  Convertible  Cumulative  Preferred  Stock  (the  "Preferred
Stock") described herein,  upon receipt of Common Stock issuable in lieu of cash
dividends,  or upon exercise of certain outstanding  warrants to purchase shares
of Company  Common Stock  granted at the same time as the Preferred  Stock.  The
Selling  Shareholders  may offer their  Shares  from time to time  through or to
brokers or dealers in the over-the-counter market at market prices prevailing at
the time of sale or in one or more negotiated  transactions at prices acceptable
to the Selling Shareholders.  The Company will not receive any proceeds from the
sale of Shares by the Selling Shareholders. See "Plan of Distribution."

         The  Company  will bear all  expenses  of the  offering  (estimated  at
$12,000),   except  that  the  Selling  Shareholders  will  pay  any  applicable
underwriter's  commissions  and expenses,  brokerage fees or transfer  taxes, as
well as any fees and  disbursements  of  counsel  and  experts  for the  Selling
Shareholders.

         The Shares may be sold from time to time in  transactions on the Nasdaq
National Market at the market prices then  prevailing,  in privately  negotiated
transactions  or  otherwise.   In  connection   with  any  sales,   the  Selling
Shareholders  and any  brokers and  dealers  participating  in such sales may be
deemed to be "underwriters"  within the meaning of the Securities Act. See "Plan
of Distribution."

         Datakey's  Common Stock is traded on the Nasdaq  National  Market under
the symbol of "DKEY."  The  closing  sale price of the Common  Stock on June 11,
1998 was $5.6875 per share.

         On May 15, 1998, the Company issued to certain investors 100,000 shares
of Preferred  Stock and  five-year  warrants to purchase an aggregate of 188,095
shares of the Company's  Common Stock with an exercise price of $6.30 per share.
The Preferred  Stock has dividend rights at an annual rate of eight percent (8%)
of their original  issuance price, with such dividends payable either in cash or
in shares of the Company's  Common Stock upon conversion of the Preferred Stock.
The Preferred  Stock is  convertible  through May 15, 2000 at a conversion  rate
equal to eighty  percent (80%) of the market price (defined to equal the average
closing bid price of the Company's  Common Stock for the ten-day period prior to
conversion),  subject to the minimum and maximum  conversion  rates of $2.75 and
$5.00,  respectively.  Any shares of Preferred Stock outstanding on May 15, 2000
will be  automatically  converted on the same terms as apply prior to such date.
As part of the  financing,  the  Company  also  issued to its agent  warrants to
purchase an aggregate of 37,890  shares of Common Stock at an exercise  price of
$6.60. The warrants issued to the investors and the agent are referred to herein
as the "Warrants."

    -----------------------------------------------------------------------

                 The Common Stock offered by this Prospectus is
                 speculative and involves a high degree of risk.
                     See "Risk Factors" beginning on page 3.

    -----------------------------------------------------------------------

          THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
            COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION
               OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
               ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRE-
                SENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                 The date of this Prospectus is June ___, 1998.


<PAGE>

         No  dealer,  salesman  or any other  person is  authorized  to give any
information  or to make any  representations,  other  then  those  contained  or
incorporated  by reference in this  Prospectus,  in connection with the offering
contemplated  hereby, and, if given or made, such information or representations
must  not be  relied  upon  as  having  been  authorized  by the  Company.  This
Prospectus does not constitute an offer to sell or a solicitation of an offer to
buy any securities  other than the registered  securities to which it relates or
in any  jurisdiction  to any person to whom it is unlawful to make such offer or
solicitation in such  jurisdiction.  Neither the delivery of this Prospectus nor
any sale made hereunder shall, under any  circumstances,  create any implication
that  there has been no  change in the  affairs  of the  Company  since the date
hereof or that the information  contained or incorporated by reference herein is
correct as of any time subsequent to its date.

                              AVAILABLE INFORMATION

         Prior to this  Offering,  the Company has been subject to the reporting
requirements of the Securities Exchange Act of 1934 (the "Exchange Act"), and in
accordance therewith files reports,  proxy statements and other information with
the Commission.  The Company has filed with the  Washington,  D.C. Office of the
Commission  a  Registration  Statement on Form S-3 under the  Securities  Act of
1933, as amended (the "Securities Act"), with respect to the sale of the Shares.
This  Prospectus  does  not  contain  all of the  information  set  forth in the
Registration Statement, certain portions of which have been omitted as permitted
by the rules and regulations of the  Commission.  For further  information  with
respect to the  Company and the Shares,  reference  is made to the  Registration
Statement,   including  the  exhibits  thereto.  Statements  contained  in  this
Prospectus as to the contents of any contract or other document  referred to are
not necessarily complete,  and in each instance reference is made to the copy of
such  contract  or  other  document  filed  as an  exhibit  to the  Registration
Statement.  The Registration  Statement and the Company's  Exchange Act reports,
proxy statements and other information may be inspected by anyone without charge
at the principal office of the Commission at 450 Fifth Street, N.W., Washington,
D.C.  20549.  Copies of all or any part of such  material  may be obtained  upon
payment  of the  prescribed  fees  from  the  Public  Reference  Section  of the
Commission at 450 Fifth Street, N.W.,  Washington,  D.C. 20549. The Registration
Statement and the Company  Exchange Act filings may also be accessed through the
Commission's  Web  site  (http://www.sec.gov).  The  Company's  Common  Stock is
currently listed on the Nasdaq National Market under the symbol "DKEY."

                       DOCUMENTS INCORPORATED BY REFERENCE

         The following  documents  filed by the Company with the  Commission are
hereby  incorporated by reference in this Prospectus and shall be deemed to be a
part thereof:

          1.   The Company's  Annual  Report on Form 10-KSB,  as amended by Form
               10-KSB/A-1, for the fiscal year ended December 31, 1997;

          2.   The  Company's  Quarterly  Report on Form  10-QSB for the quarter
               ended  April 4,  1998;

          3.   The Company's Form 8-K dated May 19, 1998.

         All documents filed by the Company  pursuant to Sections 13(a),  13(c),
14 or 15(d) of the Exchange Act after the date of this  Prospectus  and prior to
the termination of the offering of the Shares shall be deemed to be incorporated
by reference in this  Prospectus and to be a part hereof from the date of filing
of such documents.

         The Company will provide  without charge to each person,  including any
beneficial  owner,  to whom a copy of this  Prospectus  is  delivered,  upon the
written or oral  request of such person,  a copy of any or all of the  documents
incorporated  herein by reference (not including the exhibits to such documents,
unless  such  exhibits  are  specifically  incorporated  by  reference  in  such
documents). Requests for such copies should be directed to Alan G. Shuler, Chief
Financial  Officer,   Datakey,  Inc.,  407  West  Travelers  Trail,  Burnsville,
Minnesota 55337, telephone (612) 890-6850.



<PAGE>


                                 COMPANY SUMMARY

         Datakey, Inc. was incorporated under the laws of the State of Minnesota
in 1976 under the name "The Systems Group,  Inc." In 1980,  the Company  changed
its name to Datakey,  Inc. The Company  provides  product,  subsystem and system
solutions to record,  store and transmit  electronic  information.  Datakey also
manufactures and sells products and systems directed to the information security
market which will enable user  identification  and  authentication,  secure data
exchange and information validation.  It also provides OEM products,  consisting
of proprietary memory keys, cards and other custom-shaped tokens that serve as a
convenient way to carry  electronic  information  and are packaged to survive in
portable environments.

         The  Company's  first  portable  information  system,  consisting of an
electronic key and support electronics,  was introduced in 1981 for applications
requiring convenient storage,  transportation and management of information. The
Company's current system utilizes semiconductor  technology to provide a storage
device more versatile than conventional  portable  information  products such as
keys,  badges and magnetic stripe cards.  The Company's  current product line of
portable  data  carriers  and  associated   interface  products  provide  up  to
16,384,000  bits of data storage which are used in a wide range of  applications
including communications security, computer security, facility security, vending
and process control.

         Each of the Company's personal portable information systems consists of
one or more  portable data  carriers,  access  devices and, for certain  models,
interface modules containing  microprocessors.  These components,  together with
the user's processor-based equipment,  function as an integrated system allowing
instantaneous  processing of  personalized  data carried  within a portable data
carrier.  Through the incorporation of advanced semiconductor memory technology,
the  Company's  portable  data  carrier  is able to store and carry  substantial
amounts of  information.  When the portable data carrier is used in  conjunction
with  the  other  components  of  the  Company's  system,   information  can  be
selectively  altered,  added to or  erased,  as  required,  to  effectively  and
reliably manage or control a particular activity or transaction.

         The Company has  introduced  an end-user  system level product which is
designed to provide  electronic  signatures  on computer  aided  drafting  (CAD)
drawings and additional  end-user  systems that are designed to provide advanced
information security utilizing digital signatures and encryption.  These systems
incorporate  hardware and software to provide a higher level of security than is
obtainable with current software only solutions.

         The  Company's  principal  executive  offices  are  located at 407 West
Travelers Trail, Burnsville,  Minnesota 55337, and its telephone number is (612)
890-6850.

                                  RISK FACTORS

         An investment in the Securities  offered hereby  involves a high degree
of risk.  The  Securities  offered hereby should not be purchased by persons who
cannot afford the entire loss of their investment.  Prospective investors should
carefully consider the following  factors,  in addition to the other information
presented in this Memorandum, in evaluating the Company and its businesses. This
Prospectus  contains certain  forward-looking  statements.  The Company's actual
results  could  differ  materially  from the results  currently  anticipated  by
management  of the Company in such  forward-looking  statements as a result of a
variety of factors,  including,  but not limited to,  "Risk  Factors"  described
below, and elsewhere, in this Prospectus.

   1. Reliance on Information Security Products: The Company's future growth and
profitability  is to a  significant  extent  dependent  on  the  success  of its
information security (Integrated System Solutions) products, which is subject to
all of the risks inherent in the establishment of any new business venture.  The
Company's future growth and  profitability is subject to the continuing  success
of its information  security product development  efforts, but more importantly,
to the success of its  marketing  and sales  efforts.  If, for any  reason,  the
Company  is  unable  to  successfully  build its  information  security  product
business,  its ability to continue  operations  in its current  form would be in
doubt.

   2. Risk of rapid  technological  change: In the information  security market,
Datakey  faces   significant  risks  due  to  the  rapid  changes  in  available
technology.  Datakey's  information security end-user products such as SignaSURE

<PAGE>

CIP and SignaSURE ESS will integrate hardware tokens with software that provides
a much higher level of security than software  implementations  alone.  Software
only solutions may be developed in the future which would provide this security.
Such development could materially adversely affect Datakey's business.

   3. Dependence on customer acceptance:  While Datakey performs market research
and beta testing to determine  the  viability of its new  products,  actual user
acceptance  will  ultimately  dictate  the  success of the  marketing  and sales
efforts of new products such as SignaSURE  CIP and ESS.  There are no assurances
that Datakey's products will ultimately receive satisfactory customer acceptance
or that  investments  already made and  additional  investments  planned for the
remainder of 1998 will result in a financial return.

   4. Delays in product delivery  schedules:  Datakey's  success depends to some
extent on its ability to meet its  currently  scheduled  development  timetable.
Delays in the release of new  products  will cause  operational  inefficiencies,
increased  development  costs  and  reduced  revenues  and may  affect  customer
acceptance.

   5.  Competition:  While  Datakey  believes  that its  strategy  of  providing
token-based  product solutions at a price that is competitive with software-only
products is attainable,  there are no assurances that competitive pressures will
not force the Company to accept reduced margins to compete in the future.  Large
companies with  significantly  greater  resources  have  recognized the need for
information  security and will likely enter this market as competitors with much
greater  financial  resources.  A portion  of the new  end-user  products'  cost
consists of royalties and license fees which would need to be  re-negotiated  in
order to maintain acceptable profit margins.

   6. Risk of integrated  information security products:  Although the Company's
new products will operate  seamlessly  with popular  application  programs,  new
application  programs  that  integrate  information  security into their product
could erode the future market for these Datakey products.

   7. Dependence on new marketing and sales organization:  The future revenue of
Datakey  end-user  systems is  dependent  on the  success of a new and  untested
marketing and direct sales organization.

   8.  Competition  from  other  information   transmission   media:   Corporate
utilization  of  the  Internet  and  internal   intranets  dictate  a  need  for
information  security,  but there are no  assurances  that  other,  more  secure
information transmission media may not become available in the future that would
preclude the need for the type of information security provided by the Company's
products.

   9. Need for additional  capital:  The need for additional capital will depend
primarily on the success of its information security products. If the Company is
not successful with its integrated system solutions products, the Company may be
forced to curtail or  discontinue  operations  unless it can obtain  significant
additional  capital.  Such capital may not be available on terms satisfactory to
the Company, or at all.



<PAGE>


                                 USE OF PROCEEDS

         The  Company is not  selling any of the Shares and will not receive any
proceeds from the sale of the Shares by the Selling Shareholders.

                              SELLING SHAREHOLDERS

         Set forth below are the names of the Selling  Shareholders,  the number
of shares of Common Stock of the Company  beneficially  owned by each of them on
the date hereof,  the number of shares  offered hereby and the percentage of the
outstanding Common Stock to be owned if all the shares registered  hereunder are
sold by the Selling  Shareholders.  To the knowledge of the Company, none of the
Selling   Shareholders  has  had  within  the  past  three  years  any  material
relationship  with the  Company  except  as set  forth in the  footnotes  to the
following  table.  The shares  offered  hereby shall be deemed to include shares
offered by any pledgee,  donee, transferee or other successor in interest of any
of the Selling  Shareholders  listed  below,  provided  that this  prospectus is
amended or supplemented if required by applicable law.
<TABLE>
<CAPTION>

                                                            Number of Shares                                   %
                                                           Beneficially Owned               Number of        Owned
                                                  -----------------------------------         Shares         After
                                                                Warrant                      Offered        Offering
 Name                                             Shares(1)      Shares        Total          Hereby          (2)
- -----------------------------------               ---------     -------        -----        ---------       --------
<S>                                                <C>           <C>           <C>           <C>              <C> 
Special Situations Private Equity
   Fund, L.P.(3)                                   336,362       110,119       446,481       446,481           *
Special Situations Technology
   Fund, L.P.(3)                                    90,910        29,763       120,673       120,673           *
Gary Kohler IRA                                      9,095         2,978        12,073        12,073           *
Robert G. Allison                                   12,268         2,379        14,647         9,647           *
Shirley A. Baxter, TTEE FBO Shirley A.
   Baxter Rev Trust U/A dtd 7/3/96                   7,268         2,379         9,647         9,647           *
Craig L. Campbell                                    7,268         2,379         9,647         9,647           *
Piper Jaffray as Cust FBO Bradley A.
   Erickson IRA                                      7,268         2,379         9,647         9,647           *
Piper Jaffray as Cust FBO Richard C.
   Perkins IRA                                       7,268         2,379         9,647         9,647           *
David M. Westrum TTEE FBO David M.
   Westrum Rev Living Trust dtd 6/1/97               7,268         2,379         9,647         9,647           *
Pyramid Partners, L.P.                              25,625         8,389        34,014        34,014           *
Industricorp & Co., Inc. FBO Twin City
   Carpenters Pension Plan                          57,455        18,810        76,265        76,265           *
Daniel S. and Patrice M. Perkins, JT                11,491         3,762        15,253        15,253           *
Paul R. Kuehn                                                     14,209        14,209        14,209           *
David B. Johnson                                                  14,209        14,209        14,209           *
Eldon C. Miller                                                    4,736         4,736         4,736           *
Stanley D. Rahm                                                    4,736         4,736         4,736           *
                                                   -------       -------       -------       -------          
TOTAL                                              579,545       225,985       805,531       800,531(4)
</TABLE>

 *       Less than 1.0%.
(1)      The number of shares of Common  Stock shown as  beneficially  owned and
         offered by the Selling  Shareholders  represents or includes the number
         of shares which the Company has initially agreed to register,  assuming
         the minimum  conversion  price of $2.75 per share. The number of shares
         reflected  herein  may differ  from the  number of shares  beneficially
         owned as  reported by certain  Selling  Shareholders  due to  different
         assumptions with respect to the conversion price.  Pursuant to Rule 416

<PAGE>

         under the Securities  Act, the number of shares of Common Stock offered
         by the Selling  Shareholders  hereby and  included in the  Registration
         Statement  of  which  this  Prospectus  is a part  also  includes  such
         presently indeterminate number of additional shares as may be issued on
         conversion of the Preferred  Stock and in payment of dividends  thereon
         pursuant to the provisions of the  Certificate  of Designation  for the
         Preferred Stock regarding  determination  of the applicable  conversion
         price and the dividend calculation rate. Accordingly, the actual number
         of shares of Common Stock issued or issuable upon the conversion of the
         Preferred  Stock and the  payment  of  dividends  thereon is subject to
         adjustment  depending  upon  factors  which  cannot be predicted by the
         Company at this time,  including among others, the future market prices
         of the Common Stock and the payment of dividends on the Preferred Stock
         in  additional  shares of Common  Stock.  Pursuant  to the terms of the
         Certificate of Designation for the Preferred Stock, the Preferred Stock
         is  convertible by each holder thereof and dividends are payable all in
         cash or all in shares of Common Stock.  The above  numbers  assume that
         the Selling  Shareholders  will  exercise the Warrants for cash. If the
         Selling Shareholders use the cashless exercise alternative,  the actual
         number of shares of Common Stock issued will be fewer, depending on the
         market value of the underlying shares of Common Stock immediately prior
         to exercise.

(2)      The percentage of shares beneficially owned by each Selling Shareholder
         is based on 2,943,901 shares of Common Stock outstanding as of the date
         hereof. Assumes the sale of all the Shares being offered hereby.

(3)      Special  Situations  Private Equity Fund,  L.P. and Special  Situations
         Technology  Fund, L.P. may be deemed to be affiliates  because they are
         managed by investment advisers principally owned by Mr. Austin W. Marxe
         and Mr. David M.  Greenhouse.  Messrs.  Marxe and  Greenhouse  disclaim
         beneficial ownership in such shares.

(4)      Does not include up to an additional  95,604 shares issuable in lieu of
         cash dividends occurring at a cumulative annual rate of 8%.

         The Selling  Shareholders and their  respective  officers and directors
have not held any  positions  or office or had any other  material  relationship
with the Company or any of its affiliates within the past three years.

         The Company has agreed with the Selling  Shareholders  to file with the
Commission,  under the Securities  Act, a  Registration  Statement of which this
Prospectus  forms a part,  with  respect  to the resale of the  Shares,  and has
agreed to prepare and file such amendments and  supplements to the  Registration
Statement as may be necessary to keep the Registration Statement effective until
the  earlier  of (i) five  years  from  the  effectiveness  of the  Registration
Statement, or (ii) the date on which all of the Shares have been sold.

                              PLAN OF DISTRIBUTION

         All or a portion of the  Shares  offered  by the  Selling  Shareholders
hereby may be sold from time to time by the Selling Shareholders or by pledgees,
donees,  transferees or other successors in interest.  Such sales may be made in
the over-the-counter  market or otherwise at prices and at terms then prevailing
or at  prices  related  to the  then  current  market  price,  or in  negotiated
transactions.  The Shares may be sold by one or more of the following means: (a)
ordinary  brokerage or market making  transactions and transactions in which the
broker or dealer  solicits  purchasers;  (b) block trades in which the broker or
dealer so engaged  will attempt to sell the Shares as agent but may position and
resell a portion of the block as principal to facilitate  the  transaction;  and
(c)  purchases by a broker or dealer as principal  and resales by such broker or
dealer for its account pursuant to this Prospectus.  In effecting sales, brokers
or dealers engaged by the Selling  Shareholders may arrange for other brokers or
dealers to participate. Brokers or dealers will receive commissions or discounts
from the Selling  Shareholders in amounts to be negotiated  immediately prior to
the sale. Such brokers or dealers and any other participating brokers or dealers
may be deemed to be  "underwriters"  within the meaning of the Securities Act in
connection  with  such  sales.  In  addition,  any  securities  covered  by this
Prospectus which qualify for sale pursuant to Rule 144 under the Act may be sold
under Rule 144 rather than pursuant to this Prospectus.

         The Company and the Selling  Shareholders have agreed to indemnify each
other  against  certain  liabilities,  including  liabilities  arising under the
Securities Act.


<PAGE>

                            DESCRIPTION OF SECURITIES

         The  aggregate  number  of shares of stock  which the  Company  has the
authority to issue is 12,500,000  shares,  consisting  of  10,000,000  shares of
Common Stock, par value $.05,  400,000 of Convertible  Preferred Stock,  150,000
shares of Series A Convertible  Cumulative  Preferred Stock and 1,950,000 shares
of undesignated shares. Holders of Common Stock have no cumulative voting rights
and no preemptive rights. Upon liquidation or dissolution, the holders of Common
Stock will be entiteld to share ratably in all assets available for distribution
after the  payment or  provision  for payment of all debts and  liabilities  and
subject  to the  rights  of the  holders  of any  preferred  stock  which may be
outstanding.  Each share of Common  Stock is entitled to  dividends  as may from
time to time  be  declared  by the  Board  of  Directors  out of  funds  legally
available therefor. The shares of Common Stock are quoted on the Nasdaq National
Market under the symbol "DKEY." The outstanding  shares of Common Stock are, and
the shares of Common Stock offered hereby will be, fully paid and nonassessable.

                                  LEGAL MATTERS

         Certain legal matters  associated  with the Shares being offered hereby
will be passed upon for the Company by  Fredrikson & Byron,  P.A.,  Minneapolis,
Minnesota.

                                     EXPERTS

         The consolidated  financial statements  incorporated in this prospectus
by reference from the Company's  Annual Report on Form 10-KSB for the year ended
December  31, 1997 have been  audited by  McGladrey & Pullen,  LLP,  independent
auditors,  as stated in their report, which is incorporated herein by reference,
and have been so  incorporated  in  reliance  upon the report of such firm given
upon their authority as experts in accounting and auditing.

                                TABLE OF CONTENTS

                                                                Page
                Available Information                             2
                Documents Incorporated By Reference               2
                Company Summary                                   3
                Risk Factors                                      3
                Use of Proceeds                                   5
                Selling Shareholders                              5
                Plan of Distribution                              6
                Description of Securities                         7
                Legal Matters                                     7
                Experts                                           7



<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution

The estimated expenses in connection with this offering are as follows:

           Securities and Exchange Commission Filing Fee             $  1,478
           Legal Fees and Expenses                                      6,000
           Accounting Fees and Expenses                                 2,000
           Printing                                                       500
           Miscellaneous                                                2,000
                                                                     ========
                    Total Expenses                                   $ 11,978
                                                                     ========


Item 15.  Indemnification of Directors and Officers.

         Section  302A.521 of the Minnesota  Business  Corporation  Act provides
that a  corporation  shall  indemnify  any person who was or is threatened to be
made a party to any  proceeding  by reason of the  former  or  present  official
capacity of such person,  against  judgments,  penalties  and fines,  including,
without limitation, excise taxes assessed against such person with respect to an
employee benefit plan, settlements and reasonable expenses, including attorneys'
fees  and  disbursements,  incurred  by  such  person  in  connection  with  the
proceeding,  if, with respect to the acts or omissions of such person complained
of  in  the  proceeding,  such  person  has  not  been  indemnified  by  another
organization or employee  benefit plan for the same expenses with respect to the
same acts or  omissions,  acted in good faith,  received  no  improper  personal
benefit and Section 302A.255 (which pertains to director conflicts of interest),
if applicable,  has been satisfied; in the case of a criminal proceeding, had no
reasonable cause to believe the conduct was unlawful; and in the case of acts or
omissions by person in their official  capacity for the corporation,  reasonably
believed that the conduct was in the best  interests of the  corporation,  or in
the  case  of  acts  or  omissions  by  persons  in  their  capacity  for  other
organizations,  reasonably believed that the conduct was not opposed to the best
interests of the corporation.

         Section  302A.521 also permits  Minnesota  corporations  to amend their
Articles of Incorporation to limit or eliminate  personal liability of directors
to the  corporation  or its  shareholders  for  monetary  damages  for breach of
fiduciary  duty;  however,  forbids any  limitation or  elimination  of director
liability  for (i) a breach  of the  director's  duty of  loyalty,  (ii) acts or
omissions not in good faith or that involve intentional  misconduct or a knowing
violation of law, (iii) corporate  distributions  which are either illegal or in
contravention of restrictions in the Articles,  Bylaws or any agreement to which
the corporation is a party,  (iv) violations of Minnesota  securities  laws, (v)
any transaction from which the director derived an improper personal benefit, or
(vi) any act or omission  occurring prior to the effective date of the provision
in the corporation's Articles eliminating or limiting liability.

         Article 6.1 of the Registrant's Restated Articles of Incorporation,  as
amended, reads as follows:

         To the fullest extent permitted by the Minnesota  Business  Corporation
         Act as the same exists or may hereafter be amended,  a director of this
         corporation  shall not be personally  liable to the  corporation or its
         shareholders  for monetary  damages for breach of  fiduciary  duty as a
         director.

         The Company's  Amended  Bylaws provide for the  indemnification  of its
directors, officers, employees and agents in accordance with, and to the fullest
extent permitted by, Section 302A.521 of the Minnesota Business Corporation Act,
as amended from time to time.


<PAGE>

         Insofar as the  indemnification  of liabilities  arising under the 1933
Act, as amended, may be permitted to directors, officers and controlling persons
of  the  Company  pursuant  to  the  provisions  of  its  Restated  Articles  of
Incorporation,  Restated  Bylaws and the  provisions of the  Minnesota  Business
Corporation  Act, or otherwise,  the Company has been advised by counsel that in
the opinion of the Securities and Exchange  Commission,  such indemnification is
against  public policy as expressed in the Act, as amended,  and is,  therefore,
unenforceable.

Item 16.  Exhibits.

         See Exhibit Index on page following signatures.


Item 17.  Undertakings.

(a)      The undersigned Registrant hereby undertakes:

         (1) To file,  during any period in which it offers or sells securities,
a post-effective amendment to this registration statement to:

                  (i)   Include  any prospectus required by  section 10(a)(3) of
                  the Securities Act;

                  (ii)  Reflect in the  prospectus  any facts or events  arising
                  after the effective date of the Registration Statement (or the
                  most   recent   post-effective   amendment   thereof)   which,
                  individually  or in the  aggregate,  represents a  fundamental
                  change  in the  information  set  forth  in  the  registration
                  statement; and

                  (iii) Include any additional material information with respect
                  to the plan of  distribution  not previously  disclosed in the
                  Registration   Statement  or  any  material   change  to  such
                  information in the Registration Statement.

Provided,  however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
information  required  to be  included in a  post-effective  amendment  by those
paragraphs is contained in periodic  reports file by the Registrant  pursuant to
section  13 or section  15(d) of the  Securities  Exchange  Act of 1934 that are
incorporated by reference in the Registration Statement.

         (2) That for  determining  liability  under the Securities Act of 1933,
each such  post-effective  amendment  shall be  deemed to be a new  registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof.

         (3) To remove from registration by means of a post-effective  amendment
any of the securities that remain unsold at the termination of the offering.

(b) Insofar as indemnification  for liabilities arising under the Securities Act
of 1933 may be permitted to directors,  officers and controlling  persons of the
Registrant pursuant to the foregoing  provisions,  or otherwise,  the Registrant
has been advised that in the opinion of the Securities  and Exchange  Commission
such indemnification is against public policy as expressed in the Securities Act
of  1933  and is,  therefore,  unenforceable.  In the  event  that a  claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
Registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  Registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act of 1933 and will be governed by the final adjudication of such issue.

(c) The undersigned Registrant further undertakes that:

         (1) For purposes of determining  any liability under the Securities Act
of 1933, the  information  omitted from the form of prospectus  filed as part of
this  registration  statement in reliance upon Rule 430A and contained in a form
of  prospectus  filed by the  registrant  pursuant to Rule  424(b)(1)  or (4) or
497(h) under the Securities Act shall be deemed to be part of this  registration
statement as of the time it was declared effective.


<PAGE>

         (2) For the purpose of determining  any liability  under the Securities
Act of 1933,  each  post-effective  amendment that contains a form of prospectus
shall be deemed to be a new  registration  statement  relating to the securities
offered  therein,  and the  offering  of such  securities  at that time shall be
deemed to be the initial bona fide offering thereof.

(d)  The  undersigned   Registrant  hereby  undertakes  that,  for  purposes  of
determining  any liability  under the Securities Act of 1933, each filing of the
Registrant's  annual  report  pursuant to Section  13(a) or Section 15(d) of the
Securities  Exchange  Act of 1934  (and,  where  applicable,  each  filing of an
employee  benefit  plan's  annual  report  pursuant  to  Section  15(d)  of  the
Securities  Exchange  Act of 1934)  that is  incorporated  by  reference  in the
Registration  Statement  shall  be  deemed  to be a new  registration  statement
relating to the securities offered therein,  and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.


<PAGE>



                                   SIGNATURES

         In accordance with the  requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this registration
statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in the City of Burnsville, State of Minnesota, on June 12, 1998.

                               Datakey, Inc.

                               By:  /s/ Carl P. Boecher
                                    Carl P. Boecher
                                    President and Chief Executive Officer
                                    (Principal Executive Officer)

                               By:  /s/ Alan G. Shuler
                                    Alan G. Shuler
                                    Vice President and Chief Financial Officer
                                    (Principal Financial and Accounting Officer)


                                POWER OF ATTORNEY

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Registration  Statement  has  been  signed  by  the  following  persons  in  the
capacities  and on the dates  indicated.  Each person  whose  signature  to this
Registration  Statement  appears below hereby  constitutes  and appoints Carl P.
Boecher  and Alan G.  Shuler,  and each of them,  as his or her true and  lawful
attorney-in fact and agent, with full power and substitution,  to sign on his or
her behalf individually and in the capacity stated below and to perform any acts
necessary  to be done  in  order  to  file  all  amendments  and  post-effective
amendments  to this  Registration  Statement,  and any  and all  instruments  or
documents filed as part of or in connection with this Registration  Statement or
the  amendments  thereto,  and each of the  undersigned  does hereby  ratify and
confirm all that said  attorney-in-fact  and agent,  or his or her  substitutes,
shall do or cause to be done by virtue hereof.

 Signatures                    Title                                  Date


 /s/ Carl P. Boecher           President and Chief                June 12, 1998
 Carl P. Boecher               Executive Officer

 /s/ Alan G. Shuler            Vice President and                 June 12, 1998
 Alan G. Shuler                Chief Financial Officer

 /s/ Thomas R. King            Director and Secretary             June 12, 1998
 Thomas R. King

                               Director                           
 Terrence W. Glarner

 /s/ Gary R. Holland           Director                           June 12, 1998
 Gary R. Holland

 /s/ Eugene W. Courtney        Director                           June 12, 1998
 Eugene W. Courtney

 /s/ John H. Underwood         Director                           June 12, 1998
 John H. Underwood






<PAGE>








                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  DATAKEY, INC.
                            EXHIBIT INDEX TO FORM S-3


Exhibit
Number                    Description

3.1      Restated Articles of Incorporation, as amended

4.1      Certificate  of Designation  of Series A Preferred  Stock  (included in
         Articles of Incorporation--see Exhibit 3.1)

5.1      Opinion and Consent of Fredrikson & Byron, P.A.

10.1     Preferred  Stock  Purchase  Agreement  dated May 15,  1998  between the
         Company and certain investors

10.2     Registration  Rights  Agreement  dated May 15, 1998 between the Company
         and certain investors.

23.1     Consent of McGladrey & Pullen, LLP

23.2     Consent of Fredrikson & Byron, P.A. (included in Exhibit 5.1)

24.1     Powers of Attorney (included as part of the signature page hereto)



                                 CERTIFICATE OF
                      RESTATED ARTICLES OF INCORPORATION OF
                                  DATAKEY, INC.



         We the  undersigned  William P. Flies and Thomas R. King,  respectively
the  president  and  secretary of Datakey,  Inc., a  corporation  subject to the
provisions of the Minnesota  Business  Corporations Act, do hereby certify that,
pursuant to action  taken by the  directors  of the  Corporation  at a regularly
scheduled  meeting thereof and a majority vote of the outstanding  shares of the
Corporation  present  in person or by proxy at an annual  meeting  thereof,  the
Corporation effective as of May 24, 1982 elected to become governed by Minnesota
Statutes Ch. 302A and, in addition,  approved and adopted the following Restated
Articles of Incorporation  to supercede and take place of the existing  Articles
of Incorporation.

                                    ARTICLE I

         The name of the Corporation is Datakey, Inc.


                                   ARTICLE II

         The registered  office of this Corporation is located at 12281 Nicollet
Avenue South, Burnsville, Minnesota, 55337.

                                   ARTICLE III

         3.01 The  aggregate  number of shares of stock  which this  Corporation
shall have the authority to issue is  5,000,000.  All common stock issued by the
Corporation shall have a par value of $.05 per share.

         3.02.  The  board of  directors  may  from  time to time  establish  by
resolution  different  classes  or series of shares  and may fix the  rights and
preferences of said shares in any class or series.

         3.03.  No  shareholder  of the  Corporation  shall have any  preemptive
rights.

         3.04. No shareholder shall be entitled to any cumulative voting rights.

         3.05. The shareholders shall take action by the affirmative vote of the
holders of a  majority  of the voting  power of all voting  shares  outstanding,
except  where a larger  proportion  is  required  by law,  these  articles  or a
shareholder control agreement.


<PAGE>

                                   ARTICLE IV

         The name and address of the original  incorporator of this  Corporation
is: William P. Flies, 12808 Woodview Lane, Burnsville, Minnesota, 55337.

                                    ARTICLE V

         The names and addresses of the present board of directors are:

         William P. Flies                            Richard A. Walter
         12281 Nicollet Avenue                       10101 E. Bren Road
         Burnsville, MN  55337                       Minnetonka, MN  55343

         Thomas R. King                              Timothy P. Stepanek
         600 Midwest Plaza Bldg.                     1730 Midwest Plaza Bldg.
         Minneapolis, MN  55402                      Minneapolis, MN  55402


         IN WITNESS  WHEREOF,  we have  hereunto  set our hands this 24th day of
May, 1982.

                                                  /s/ William P. Flies
                                                 William P. Flies, President

                                                  /s/ Thomas R. King
                                                 Thomas R. King, Secretary

STATE OF MINNESOTA         )
                                    ) ss.
COUNTY OF HENNEPIN         )

         William P. Flies and Thomas R. King,  being duly sworn on oath,  depose
and say that they are,  respectively,  the  president  and secretary of Datakey,
Inc., the corporation named in the foregoing certificate;  that said certificate
contains  a true  statement  of the  action  of the  shareholders  and  board of
directors of said  corporation;  that said  certificate is executed on behalf of
said corporation by its express authority; and that they further acknowledge the
same to be  their  free  act  and  deed  and  the  free  act,  and  deed of said
corporation.

                                                   /s/ William Flies

                                                   /s/ Thomas R. King

Subscribed and sworn to before me this 24th day of May, 1982.

                                                   /s/ Elizabeth A. Forehand
                                                   Notary Public - Minnesota
                                                   Hennepin County
                                                   My commission expires 3-13-87

<PAGE>



                            OFFICERS' CERTIFICATE OF
                                  DATAKEY, INC.

         We,  the  undersigned,  John H.  Underwood  and  Thomas  R.  King,  the
respective  President and Secretary of Datakey,  Inc., a corporation  subject to
the provisions of Minnesota  Statutes,  Chapter 302A, do hereby certify that the
Minutes of Action Without  Meeting of the Board of Directors of the  corporation
dated  December 23, 1985,  a copy of which is attached  hereto and  incorporated
herein by reference,  in which the Board of Directors authorized the issuance of
Preferred  Stock,  were  unanimously  adopted  and  approved  by such  Board  of
Directors.
         IN  WITNESS  WHEREOF,  we have  subscribed  our names  this 23rd day of
December, 1985.

                                                  /s/ John H. Underwood
                                                 John H. Underwood
                                                 President


                                                  /s/ Thomas R. King
                                                 Thomas R. King
                                                 Secretary

STATE OF MINNESOTA         )
                                    ) ss.
COUNTY OF HENNEPIN         )
         On this 23rd day of December,  1985,  before a Notary Public within and
for said County, personally appeared John H. Underwood and Thomas R. King, to me
personally  known,  being  by me  duly  sworn,  and did say  that  they  are the
President and Secretary,  respectively,  of the corporation named above and that
the said  instrument was signed on behalf of the corporation and the persons who
signed  said  instrument  acknowledged  it to be the  free  act and deed of said
corporation.

                                                  /s/ Diane M. Dossetto
                                                  Notary Public - Minnesota
                                                  Ramsey County
                                                  My commission expires 7-10-90


<PAGE>


                        MINUTES OF ACTION WITHOUT MEETING
                          OF THE BOARD OF DIRECTORS OF
                                  DATAKEY, INC.

         The undersigned,  being all of the members of the Board of Directors of
Datakey,   Inc.,  hereby  adopt,  by  action  without  meeting,   the  following
resolutions to be effective as of December 23, 1985, to-wit:

         RESOLVED:  That the  Preferred  Stock  authorizing  resolutions,  which
         resolutions  are  attached  hereto as  Exhibit A and which  resolutions
         establish a class of Convertible Preferred Stock be and they hereby are
         adopted.

         FURTHER  RESOLVED:  That the officers of the  corporation  be, and they
         hereby  are,  authorized  and  directed  to  take  whatever  action  is
         necessary to effect the foregoing resolutions.


                                                /s/ John H. Underwood
                                                John H. Underwood


                                                /s/ William P. Flies
                                                William P. Flies


                                                /s/ Timothy A. Stepanek
                                                Timothy A. Stepanek


                                                /s/ Thomas R. King
                                                Thomas R. King



<PAGE>


                                    EXHIBIT A


                                MINUTES OF ACTION
                             WITHOUT MEETING OF THE
                       BOARD OF DIRECTORS OF DATAKEY, INC.



         The undersigned,  being all of the members of the Board of Directors of
Datakey, Inc., hereby adopt, by action without meeting, the following resolution
to be effective as of December 23, 1985, to-wit:

         WHEREAS,  the Articles of Incorporation  of Datakey,  Inc., a Minnesota
corporation, authorize the corporation to issue an aggregate of 5,000,000 shares
of capital stock and empower the  corporation's  Board of Directors to establish
from time to time by resolution different classes or series of shares and to fix
the rights and preferences of said shares in any class or series; and

         WHEREAS,  there  currently are outstanding  2,979,750  shares of Common
Stock,  the  remaining  2,020,250  authorized  shares  of  capital  stock  being
undesignated; and

         WHEREAS,  the  corporation's  Board of Directors  deems it to be in the
best interests of the  corporation  and its  shareholders  to establish a second
class of capital stock,  Convertible  Preferred Stock, having certain rights and
preferences;

         NOW,  THEREFORE,  BE IT RESOLVED,  that the 5,000,000 shares of capital
stock  authorized by the Articles of  Incorporation  of this corporation be, and
they hereby are,  designated  as belonging to the following  classes  having the
relative rights and preferences set forth below:

Section 1.        Shares and Classes Authorized.

         Of the 5,000,000  shares which the  corporation is authorized to issue,
4,000,000  shares shall be  designated  Common  Stock,  par value $.05,  400,000
shares shall be designated  Convertible Preferred Stock and 600,000 shares shall
be undesignated capital stock.

Section 2.        Right and Preferences of Convertible Preferred Stock.

         The  rights  and  preferences  of the  400,000  shares  of  Convertible
Preferred  Stock shall be as set forth in Exhibit 1 which is attached hereto and
made a part hereof.


                                              /s/ William P. Flies
                                              William P. Flies


                                              /s/ John H. Underwood
                                              John H. Underwood


                                              /s/ Timothy A. Stepanek
                                              Timothy A. Stepanek


                                              /s/ Thomas R. King
                                              Thomas R. King

<PAGE>
                                                                    EXHIBIT 1


                      CERTIFICATE OF RIGHTS AND PREFERENCES
                                       OF
                           CONVERTIBLE PREFERRED STOCK
                                       OF
                                  DATAKEY, INC.


(A).     Classification of Undesignated Shares.

         Of  the  1,000,000   undesignated   shares  which  the  corporation  is
authorized to issue under its Articles of Incorporation,  400,000 of such shares
shall  all be  classified  as  shares  of  Convertible  Preferred  Stock  of the
corporation (the "Preferred  Stock").  Such shares of Preferred Stock,  together
with the 4,000,000  authorized  shares of Common Stock of the  corporation  (the
"Common Stock") and the balance of the  undesignated  shares of the corporation,
are sometimes hereinafter collectively referred to as the "capital stock".

(B).     Voting Privileges.

                  (a) General.  Each holder of  Preferred  Stock shall have that
number of votes on all matters  submitted to the  stockholders  that is equal to
the  number of shares  of  Common  Stock  into  which  such  holder's  shares of
Preferred  Stock  are then  convertible,  as  hereinafter  provided.  Except  as
otherwise  provided in subparagraph (b) below, and except as otherwise  required
by agreement or law, the shares of capital stock of the  corporation  shall vote
as a single class on all matters submitted to the stockholders.

                  (b)  Without  the  affirmative  vote  of the  holders  (acting
together  as a class) of at least a majority  (with  respect to (1) below) or at
least 90% (with  respect to (2) below) of the shares of  Preferred  Stock at the
time outstanding, the corporation shall not:

         (1)      authorize or issue any shares of stock having a priority  over
                  Preferred  Stock or  ranking on a parity  therewith  as to the
                  payment or  distribution  of assets  upon the  liquidation  or
                  dissolution, voluntary or involuntary, of the corporation; or

         (2)      amend the Articles of  Incorporation  of the corporation so as
                  to alter any existing provision relating to Preferred Stock.

                  (c) No Cumulative Voting. No holder of shares of capital stock
shall have any cumulative voting rights.

(C).     No Preemptive Rights.

         No holder of shares of any class of capital  stock shall be entitled as
such, as a matter of right,  to subscribe  for,  purchase or receive any part of
any new or additional issue of stock of any class  whatsoever,  or of securities
convertible into or exchangeable for any stock of any class whatsoever,  whether
now or hereafter  authorized and whether issued for cash or other  consideration
or by way of dividend.


<PAGE>

(D).     Cash Dividends.

         Any dividend  declared must be payable with respect to all  outstanding
shares  of  capital  stock of the  corporation.  In the event  any  dividend  is
declared with respect to the capital stock, each holder of Preferred Stock shall
be paid such cash  dividend on the basis of the number of shares of Common Stock
into which such  holder's  shares of Preferred  Stock are then  convertible,  as
hereinafter provided.

(E).     Other Terms of the Preferred Stock.

                  (a)  Liquidation  Preference.   In  the  event  of  either  an
involuntary or a voluntary  liquidation or dissolution of the  corporation,  the
holders of shares of  Preferred  Stock  shall be  entitled to receive out of the
assets of the  corporation  an amount equal to $2.50 per share.  In the event of
either  an   involuntary   or  voluntary   liquidation  or  dissolution  of  the
corporation,  payment shall be made to the holders of the Preferred Stock in the
amounts herein fixed before any payment shall be made or any assets  distributed
to the  holders  of the  Common  Stock  or any  other  class  of  shares  of the
corporation  ranking  junior to the  Preferred  Stock with respect to payment of
dividends or upon  dissolution or liquidation  of the  corporation.  If upon any
such  liquidation  or dissolution of the  corporation  the assets  available for
distribution `shall be insufficient to pay the holders of all outstanding shares
of  Preferred  Stock  the full  amounts  to  which  they  respectively  shall be
entitled,  the  holders  of  such  shares  shall  share  pro  rata  in any  such
distribution.

                  The merger or  consolidation  of the corporation  into or with
another corporation or the merger or consolidation of any other corporation into
or with the corporation (in which  consolidation  or merger the  stockholders of
the corporation receive  distribution of cash or securities or other property as
a result  of such  consolidation  or  merger),  or the sale,  transfer  or other
disposition of all or substantially all of the assets of the corporation,  shall
be deemed, for purposes of determining the amounts to be received by the holders
of the Preferred Stock in such merger,  consolidation,  sale,  transfer or other
disposition,  to be a liquidation or dissolution of the corporation for purposes
of this subparagraph (a) if the holders of a majority of the outstanding  shares
of Preferred  Stock so elect by giving written notice thereof to the corporation
at least two days before the effective date of such event.  If no such notice is
given, the provisions of subparagraph (c)(7) hereof shall apply.

                  Nothing  hereinabove  set  forth  shall  affect in any way the
right of each holder of shares of Preferred  Stock to convert such shares at any
time and from time to time in accordance with subparagraph (c) below.

                  (b)  Redemptions.  Redemptions of shares of Preferred Stock by
the  corporation  without the consent of the holders  thereof are not permitted.
Mandatory  redemptions of shares of Preferred  Stock by the  corporation are not
required.


<PAGE>

                  (c) Conversion Right;  Mandatory Conversion.  At the option of
the holders thereof, the shares of Preferred Stock shall be convertible,  at the
office of the  corporation  (or at such other office or offices,  if any, as the
Board of Directors  may  designate),  into fully paid and  nonassessable  shares
(calculated as to each  conversion to the nearest  1/100th of a share) of Common
Stock of the  corporation,  at the conversion  price,  determined as hereinafter
provided, in effect at the time of conversion, each share of the Preferred Stock
being  taken at $2.50 for the  purpose  of such  conversion.  The price at which
shares of Common Stock shall be delivered  upon  conversion  (herein  called the
"conversion price") shall be initially $2.50 per share of Common Stock (i.e., at
an  initial  conversion  rate of one  share of Common  Stock  for each  share of
Preferred Stock), provided, however, that such initial conversion price shall be
subject to  adjustment  from time to time in certain  instances  as  hereinafter
provided. The following provisions shall govern such right of conversion:

         (1)      In order to convert  shares of Preferred  Stock into shares of
                  Common  Stock of the  corporation,  the holder  thereof  shall
                  surrender at any office hereinabove  mentioned the certificate
                  or certificates therefor,  duly endorsed to the corporation or
                  in blank,  and give written notice to the  corporation at such
                  office that such holder elects to convert such shares.  Shares
                  of  Preferred  Stock  shall be deemed  to have been  converted
                  immediately  prior to the close of  business on the day of the
                  surrender of such shares for  conversion  as herein  provided,
                  and the person  entitled to receive the shares of Common Stock
                  of the  corporation  issuable  upon such  conversion  shall be
                  treated for all  purposes as the record  holder of such shares
                  of Common Stock at such time. As promptly as practicable on or
                  after the  conversion  date, the  corporation  shall issue and
                  deliver or cause to be issued and  delivered  at such office a
                  certificate or certificates for the number of shares of Common
                  Stock of the corporation issuable upon such conversion.

         (2)      The conversion  price shall be subject to adjustment from time
                  to time as hereinafter  provided.  Upon each adjustment of the
                  conversion  price  each  holder of shares of  Preferred  Stock
                  shall  thereafter  be entitled to receive the number of shares
                  of Common Stock of the corporation obtained by multiplying the
                  conversion   price  in  effect   immediately   prior  to  such
                  adjustment  by the  number  of  shares  issuable  pursuant  to
                  conversion  immediately  prior to such adjustment and dividing
                  the product  thereof by the  conversion  price  resulting from
                  such adjustment.

         (3)      Except for the issuance of Conversion  Stock and Warrant Stock
                  (as those terms are defined in the  Preferred  Stock  Purchase
                  Agreement  dated December 16, 1985 among the  corporation  and
                  the Purchasers  named therein) (a) if and whenever on or prior
                  to June  30,  1987  the  corporation  shall  issue or sell any
                  shares of its Common Stock for a consideration  per share less
                  than the conversion price in effect  immediately  prior to the
                  time of such issue or sale,  then forthwith upon such issue or
                  sale the  conversion  price  shall be reduced  to such  lesser
                  price,  and  (b) if and  whenever  after  June  30,  1987  the
                  corporation shall issue or sell any shares of its Common Stock
                  for a consideration  per share less than the conversion  price
                  in effect immediately prior to the time of such issue or sale,
                  and/or  the  corporation  shall  issue or sell any  shares  of

<PAGE>

                  Common  Stock  for a  consideration  per  share  less than the
                  market price on the date of such issue or sale, then forthwith
                  upon such issue or sale the conversion  price shall be reduced
                  to the price  (calculated  to the nearest cent)  determined by
                  dividing  (1) an amount equal to the sum of (aa) the number of
                  shares of Common Stock  outstanding  immediately prior to such
                  issue  or sale  multiplied  by the  then  existing  conversion
                  price,  and (bb) the  consideration,  if any,  received by the
                  corporation upon such issue or sale, by (2) an amount equal to
                  the  sum  of  (aa)  the  number  of  shares  of  Common  Stock
                  outstanding  immediately  prior to such issue or sale and (bb)
                  the number of shares of Common Stock thus issued or sold.

                           For  the  purposes  of  this  subparagraph  (3),  the
                  following  provisions (i) to (vii),  inclusive,  shall also be
                  applicable:

                  (i)      In case  at any  time  the  corporation  shall  grant
                           (whether  directly  or by  assumption  in a merger or
                           otherwise)   any  rights  to  subscribe   for  or  to
                           purchase,  or any  options for the  purchase  of, (a)
                           Common Stock or (b) any  obligations or any shares of
                           stock of the corporation  which are convertible into,
                           or  exchangeable  for,  Common  Stock  (any  of  such
                           obligations  or  shares  of stock  being  hereinafter
                           called "Convertible  Securities") whether or not such
                           rights or options or the right to convert or exchange
                           any  such  Convertible   Securities  are  immediately
                           exercisable, and the price per share for which Common
                           Stock is issuable upon the exercise of such rights or
                           options  or  upon  conversion  or  exchange  of  such
                           Convertible  Securities  (determined  by dividing (x)
                           the total amount,  if any,  received or receivable by
                           the corporation as consideration  for the granting of
                           such  rights or options,  plus the minimum  aggregate
                           amount of  additional  consideration  payable to the,
                           corporation  upon  the  exercise  of such  rights  or
                           options,  plus,  in  the  case  of  such  Convertible
                           Securities,   the   minimum   aggregate   amount   of
                           additional  consideration,  if any,  payable upon the
                           issue  of such  Convertible  Securities  and upon the
                           conversion  or  exchange  thereof,  by (y) the  total
                           maximum  number of shares  of Common  Stock  issuable
                           upon the  exercise  of such rights or options or upon
                           the  conversion  or exchange of all such  Convertible
                           Securities  issuable upon the exercise of such rights
                           or options) shall be less than the  conversion  price
                           in  effect  immediately  prior  to  the  time  of the
                           granting of such  rights or  options,  then the total
                           maximum  number of shares  of Common  Stock  issuable
                           upon the  exercise  of such rights or options or upon
                           conversion or exchange of the total maximum amount of
                           such   Convertible   Securities   issuable  upon  the
                           exercise of such  rights or options  shall (as of the
                           date of granting of such rights or options) be deemed
                           to have been issued for such price per share.  Except

<PAGE>

                           as provided  in  subparagraph  (6) below,  no further
                           adjustments  of the  conversion  price  shall be made
                           upon the actual issue of such Common Stock or of such
                           Convertible  Securities  upon exercise of such rights
                           or options or upon the  actual  issue of such  Common
                           Stock upon conversion or exchange of such Convertible
                           Securities.

                  (ii)     In case the corporation  shall issue or sell (whether
                           directly or by  assumption  in a merger or otherwise)
                           any Convertible Securities, whether or not the rights
                           to exchange  or convert  thereunder  are  immediately
                           exercisable, and the price per share for which Common
                           Stock is issuable  upon such  conversion  or exchange
                           (determined by dividing (x) the total amount received
                           or receivable by the corporation as consideration for
                           the  issue  or sale of such  Convertible  Securities,
                           plus  the  minimum  aggregate  amount  of  additional
                           consideration,  if any,  payable  to the  corporation
                           upon the conversion or exchange  thereof,  by (y) the
                           total  maximum  number  of  shares  of  Common  Stock
                           issuable upon the  conversion or exchange of all such
                           Convertible   Securities)  shall  be  less  than  the
                           conversion price in effect  immediately  prior to the
                           time of such  issue or sale,  then the total  maximum
                           number  of  shares  of  Common  Stock  issuable  upon
                           conversion  or  exchange  of  all  such   Convertible
                           Securities shall (as of the date of the issue or sale
                           of  such  Convertible  Securities)  be  deemed  to be
                           outstanding  and to have been  issued  for such price
                           per share,  provided  that (a) except as  provided in
                           subparagraph (6) below, no further adjustments of the
                           conversion  price shall be made upon the actual issue
                           of such Common Stock upon  conversion  or exchange of
                           such  Convertible  Securities,  and  (b) if any  such
                           issue or sale of such Convertible  Securities is made
                           upon  exercise of any rights to  subscribe  for or to
                           purchase   or  any  option  to   purchase   any  such
                           Convertible  Securities for which  adjustments of the
                           conversion price have been or are to be made pursuant
                           to other  provisions  of this  subparagraph  (3),  no
                           further  adjustment of the conversion  price shall be
                           made by reason of such issue or sale.

                  (iii)    In case the corporation  shall,  after June 30, 1987,
                           declare a  dividend  or make any  other  distribution
                           upon any capital stock of the corporation  payable in
                           Common  Stock or  Convertible  Securities,  or in any
                           rights or options  to  purchase  any Common  Stock or
                           Convertible   Securities,   any   Common   Stock   or

<PAGE>

                           Convertible   Securities,   or  any  such  rights  or
                           options,  as the case may be,  issuable in payment of
                           such dividend or distribution shall be deemed to have
                           been issued or sold without consideration.

                  (iv)     In case any  shares  of Common  Stock or  Convertible
                           Securities  or any rights or options to purchase  any
                           such Common Stock or Convertible  Securities shall be
                           issued or sold for cash, the  consideration  received
                           therefor shall be deemed to be the amount received by
                           the corporation therefor, without deducting therefrom
                           any expenses incurred or any underwriting commissions
                           or concessions  paid or allowed by the corporation in
                           connection  therewith.  In case any  shares of Common
                           Stock or  Convertible  Securities  or any  rights  or
                           options  to  purchase   any  such  Common   Stock  or
                           Convertible  Securities shall be issued or sold for a
                           consideration  other  than  cash,  the  amount of the
                           consideration   other  than  cash   received  by  the
                           corporation  shall be deemed to be the fair  value of
                           such  consideration  as  determined  by the  Board of
                           Directors  of  the  corporation,   without  deducting
                           therefrom any expenses  incurred or any  underwriting
                           commissions  or  concessions  paid or  allowed by the
                           corporation  in  connection  therewith.  In case  any
                           shares of Common Stock or  Convertible  Securities or
                           any rights or options to purchase  such Common  Stock
                           or   Convertible   Securities   shall  be  issued  in
                           connection with any merger or  consolidation in which
                           the  corporation  is the surviving  corporation,  the
                           amount of  consideration  therefor shall be deemed to
                           be the  fair  value  as  determined  by the  Board of
                           Directors of the  corporation  of such portion of the
                           assets and business of the non-surviving  corporation
                           or  corporations  as such Board shall determine to be
                           attributable   to  such  Common  Stock,   Convertible
                           Securities, rights or options, as the case may be. In
                           the  event  of any  consolidation  or  merger  of the
                           corporation  in  which  the  corporation  is not  the
                           surviving  corporation or in the event of any sale of
                           all  or  substantially  all  of  the  assets  of  the
                           corporation  for  stock  or other  securities  of any
                           other corporation, the corporation shall be deemed to
                           have  issued a number of shares of its  Common  Stock
                           for  stock or  securities  of the  other  corporation
                           computed on the basis of the actual exchange ratio on
                           which  the  transaction  was  predicated  and  for  a
                           consideration  equal to the fair market  value on the
                           date of such  transaction of such stock or securities
                           of the other corporation, and if any such calculation
                           results in adjustment of the  conversion  price,  the
                           determination of the number of shares of Common Stock
                           issuable upon  conversion  immediately  prior to such
                           merger,   conversion   or  sale,   for   purposes  of
                           subparagraph  (7) below,  shall be made after  giving
                           effect to such adjustment of the conversion price.


<PAGE>

                  (v)      In case the  corporation  shall  take a record of the
                           holders  of its  Common  Stock  for  the  purpose  of
                           entitling  them (a) to  receive a  dividend  or other
                           distribution   payable   in   Common   Stock   or  in
                           Convertible  Securities,  or in any rights or options
                           to   purchase   any  Common   Stock  or   Convertible
                           Securities,  or (b)  to  subscribe  for  or  purchase
                           Common Stock or Convertible Securities, then the date
                           of such record  shall be deemed to be the date of the
                           issue or sale of the shares of Common Stock deemed to
                           have been issued or sold upon the declaration of such
                           dividend or the making of such other  distribution or
                           the  date  of  the   granting   of  such   rights  of
                           subscription or purchase, as the case may be.

                  (vi)     The number of shares of Common Stock  outstanding  at
                           any given time shall not include shares owned or held
                           by or for the  account  of the  corporation,  and the
                           disposition of any such shares shall be considered an
                           issue or sale of Common Stock for the purpose of this
                           subparagraph (3).

                  (vii)    "Market price" shall mean the average of the high and
                           low prices of the Common Stock sales on all exchanges
                           on which the Common  Stock may at the time be listed,
                           or,  if there  shall  have  been no sales on any such
                           exchange on any such day,  the average of the bid and
                           asked  prices  at the end of  such  day,  or,  if the
                           Common  Stock shall not be so listed,  the average of
                           the bid and asked prices at the end of the day in the
                           over-the-counter market, in each case averaged over a
                           period of 20  consecutive  business days prior to the
                           date as of which "market price" is being  determined.
                           If at any time the Common  Stock is not listed on any
                           exchange  or quoted in the  over-the-counter  market,
                           the "market  price"  shall be deemed to be the higher
                           of (i) the book value  thereof as  determined  by any
                           firm of independent  public accountants of recognized
                           standing  selected by the Board of  Directors  of the
                           corporation  as of the last day of any  month  ending
                           within  60 days  preceding  the date as of which  the
                           determination  is to be made,  or (ii) the fair value
                           thereof  determined  in good  faith  by the  Board of
                           Directors  of the  corporation  as of a date which is
                           within   15  days  of  the  date  as  of  which   the
                           determination is to be made.


<PAGE>

         (4)      In case the  corporation  shall  declare a dividend  or make a
                  distribution  upon the Common Stock payable otherwise than out
                  of  earnings  or  earned  surplus   (including   dividends  or
                  distributions in Common Stock or Convertible Securities, or in
                  any  rights  or  options  to  purchase  any  Common  Stock  or
                  Convertible Securities), then thereafter each holder of shares
                  of  Preferred  Stock  upon  the  conversion  thereof  will  be
                  entitled to receive the number of shares of Common  Stock into
                  which such shares of Preferred Stock have been converted, and,
                  in addition and without payment  therefor,  the cash, stock or
                  other  securities  and other  property which such holder would
                  have received by way of dividends  (otherwise than out of such
                  earnings or surplus) if continuously  since such holder became
                  the  record  holder of such  shares of  Preferred  Stock  such
                  holder (i) had been the record  holder of the number of shares
                  of Common  Stock  then  received,  and (ii) had  retained  all
                  dividends or distributions  in stock or securities  (including
                  Common Stock or  Convertible  Securities,  or in any rights or
                  options  to   purchase   any  Common   Stock  or   Convertible
                  Securities)  payable  in respect  of such  Common  Stock or in
                  respect  of any  stock  or  securities  paid as  dividends  or
                  distributions and originating directly or indirectly from such
                  Common Stock.  For the purposes of the foregoing a dividend or
                  distribution  other than in cash shall be  considered  payable
                  out of earnings or earned surplus only to the extent that such
                  earnings or surplus  are  charged an amount  equal to the fair
                  value of such  dividend or  distribution  as determined by the
                  Board of Directors of the corporation.

         (5)      In case  the  corporation  shall  at any  time  subdivide  its
                  outstanding  shares of Common  Stock into a greater  number of
                  shares,  the conversion price in effect  immediately  prior to
                  such  subdivision  shall  be  proportionately   reduced,   and
                  conversely,  in case the outstanding shares of Common Stock of
                  the  corporation  shall be combined  into a smaller  number of
                  shares,  the conversion price in effect  immediately  prior to
                  such combination shall be proportionately increased.

         (6)      If (i) the purchase  price provided for in any right or option
                  referred  to in clause (i) of  subparagraph  (3),  or (ii) the
                  additional consideration,  if any, payable upon the conversion
                  or exchange of  Convertible  Securities  referred to in clause
                  (i) or clause (ii) of  subparagraph  (3), or (iii) the rate at
                  which any Convertible  Securities referred to in clause (i) or
                  clause  (ii)  of  subparagraph  (3)  are  convertible  into or
                  exchangeable for Common Stock, shall change at any time (other
                  than  under or by reason of  provisions  designed  to  protect
                  against  dilution),   the  conversion  price  then  in  effect
                  hereunder  shall  forthwith  be increased or decreased to such
                  conversion  price as would have  obtained had the  adjustments
                  made upon the issuance of such rights,  options or Convertible
                  Securities been made upon the basis of (a) the issuance of the
                  number  of  shares  of  Common  Stock   theretofore   actually
                  delivered  upon the exercise of such options or rights or upon
                  the conversion or exchange of such Convertible Securities, and
                  the  total  consideration   received  therefor,  and  (b)  the
                  issuance  at the  time of such  change  of any  such  options,
                  rights,  or Convertible  Securities then still outstanding for
                  the  consideration,   if  any,  received  by  the  corporation
                  therefor  and to be  received  on the  basis  of such  changed
                  price;  and on the  expiration  of any such option or right or
                  the  termination of any such right to convert or exchange such
                  Convertible  Securities,  the conversion  price then in effect

<PAGE>

                  hereunder  shall  forthwith be  increased  to such  conversion
                  price as would have obtained had the adjustments made upon the
                  issuance of such rights or options or  Convertible  Securities
                  been  made  upon the  basis of the  issuance  o the  shares of
                  Common Stock  theretofore  actually  delivered  (and the total
                  consideration  received  therefor)  upon the  exercise of such
                  rights or options or upon the  conversion  or exchange of such
                  Convertible Securities.  If the purchase price provided for in
                  any right or option  referred to in clause (i) of subparagraph
                  (3), or the rate at which any Convertible  Securities referred
                  to in  clause  (i) or  clause  (ii)  of  subparagraph  (3) are
                  convertible  into or  exchangeable  for  Common  Stock,  shall
                  decrease  at any time  under or by reason of  provisions  with
                  respect thereto designed to protect against dilution,  then in
                  case of the  delivery of Common Stock upon the exercise of any
                  such right or option or upon  conversion  or  exchange  of any
                  such Convertible Security, the conversion price then in effect
                  hereunder  shall  forthwith be  decreased  to such  conversion
                  price as would have obtained had the adjustments made upon the
                  issuance of such right,  option or  Convertible  Security been
                  made  upon  the  basis  of the  issuance  of  (and  the  total
                  consideration   received  for)  the  shares  of  Common  Stock
                  delivered as aforesaid.

         (7)      If  any  capital  reorganization  or  reclassification  of the
                  capital stock of the  corporation,  or consolidation or merger
                  of the corporation  with another  corporation,  or the sale of
                  all or substantially all of its assets to another  corporation
                  shall be effected in such a way that  holders of Common  Stock
                  shall be entitled to receive stock,  securities or assets with
                  respect  to  or in  exchange  for  Common  Stock,  then,  as a
                  condition    of   such    reorganization,    reclassification,
                  consolidation, merger or sale, and subject to subparagraph (a)
                  above, lawful and adequate provision shall be made whereby the
                  holders of Preferred Stock shall  thereafter have the right to
                  receive  upon the  basis  and upon the  terms  and  conditions
                  specified herein and in lieu of the shares of the Common Stock
                  of the corporation immediately theretofore receivable upon the
                  conversion   of  Preferred   Stock,   such  shares  of  stock,
                  securities  or assets as may be issued or payable with respect
                  to or in exchange for a number of  outstanding  shares of such
                  Common  Stock  equal to the  number of  shares  of such  stock
                  immediately  theretofore  receivable  upon the  conversion  of
                  Preferred  Stock  had such  reorganization,  reclassification,
                  consolidation,  merger  or sale  not  taken  place,  plus  all
                  dividends  unpaid and  accumulated  or accrued  thereon to the
                  date of such reorganization, reclassification,  consolidation,
                  merger  or sale,  and in any such case  appropriate  provision
                  shall be made with respect to the rights and  interests of the
                  holders  of  Preferred  Stock to the end  that the  provisions

<PAGE>

                  hereof   (including   without   limitation    provisions   for
                  adjustments  of the  conversion  price  and of the  number  of
                  shares  receivable  upon the  conversion  of Preferred  Stock)
                  shall  thereafter  be  applicable,  as  nearly  as  may  be in
                  relation  to  any  shares  of  stock,   securities  or  assets
                  thereafter  receivable upon the conversion of Preferred Stock.
                  The  corporation  shall  not  effect  any such  consolidation,
                  merger or sale,  unless prior to the consummation  thereof the
                  successor   corporation   (if  other  than  the   corporation)
                  resulting from such consolidation or merger or the corporation
                  purchasing  such  assets  shall  assume by written  instrument
                  executed and mailed to the holders of Preferred  Stock, at the
                  last  addresses of such holders  appearing on the books of the
                  corporation,  the  obligation  to deliver to such  holder such
                  shares of stock,  securities or assets as, in accordance  with
                  the  foregoing  provisions,  such  holder may be  entitled  to
                  receive.

         (8)      Upon any adjustment of the conversion  price, then and in each
                  case the  corporation  shall give written notice  thereof,  by
                  first-class mail, postage prepaid, addressed to the holders of
                  Preferred  Stock, at the addresses of such holders as shown on
                  the books of the  corporation,  which  notice  shall state the
                  conversion  price  resulting  from  such  adjustment  and  the
                  increase  or  decrease,  if  any,  in  the  number  of  shares
                  receivable  at such price  upon the  conversion  of  Preferred
                  Stock,  setting  forth in  reasonable  detail  the  method  of
                  calculation  and the facts  upon  which  such  calculation  is
                  based.

         (9)      In case at any time:

                  (i)      the  corporation  shall  declare any cash dividend on
                           its  Common  Stock at a rate in excess of the rate of
                           the last cash dividend theretofore paid;

                  (ii)     the  corporation  shall pay any  dividend  payable in
                           stock upon its Common Stock or make any  distribution
                           (other than regular cash dividends) to the holders of
                           its Common Stock;

                  (iii)    the corporation shall offer for subscription pro rata
                           to the  holders  of its Common  Stock any  additional
                           shares of stock of any class or other rights;

                  (iv)     there  shall  be  any  capital   reorganization,   or
                           reclassification   of  the   capital   stock  of  the
                           corporation,   or  consolidation  or  merger  of  the
                           corporation  with,  or sales of all or  substantially
                           all of its assets to, another corporation; or

                  (v)      there   shall   be   a   voluntary   or   involuntary
                           dissolution,   liquidation   or  winding  up  of  the
                           corporation;

                  then, in any one or more of said cases, the corporation  shall
                  give written notice,  by first-class  mail,  postage  prepaid,
                  addressed to the holders of Preferred  Stock at the  addresses
                  of such holders as shown on the books of the  corporation,  of
                  the date on which (a) the books of the corporation shall close
                  or a record shall be taken for such dividend,  distribution or
                  subscription    rights,    or   (b)    such    reorganization,
                  reclassification,  consolidation,  merger, sale,  dissolution,

<PAGE>

                  liquidation  or winding up shall take  place,  as the case may
                  be.  Such notice  shall also  specify the date as of which the
                  holders of Common  Stock of record shall  participate  in such
                  dividend,  distribution  or subscription  rights,  or shall be
                  entitled to exchange  their  Common  Stock for  securities  or
                  other   property   deliverable   upon   such   reorganization,
                  reclassification,  consolidation,  merger, sale,  dissolution,
                  liquidation,  or winding up, as the case may be. Such  written
                  notice  shall be given at least 20 days prior to the action in
                  question and not less than 20 days prior to the record date or
                  the date on which the corporation's  transfer books are closed
                  in respect thereto.

         (10)     If any event occurs as to which in the opinion of the Board of
                  Directors  of the  corporation  the other  provisions  of this
                  paragraph  (c)  are not  strictly  applicable  or if  strictly
                  applicable  would not fairly protect the rights of the holders
                  of Preferred Stock in accordance with the essential intent and
                  principles  of such  provisions,  then the Board of  Directors
                  shall  make  an   adjustment  in  the   application   of  such
                  provisions,  in  accordance  with such  essential  intent  and
                  principles, so as to protect such rights as aforesaid.

         (11)     As used in this  paragraph  (c) the term "Common  Stock" shall
                  mean and include the corporation's presently authorized Common
                  Stock and shall also include any capital stock of any class of
                  the  corporation  hereafter  authorized  which  shall  not  be
                  limited to a fixed sum or  percentage in respect of the rights
                  of the holders  thereof to  participate in dividends or in the
                  distribution  of  assets  upon the  voluntary  or  involuntary
                  liquidation,  dissolution  or winding  up of the  corporation;
                  provided that the shares receivable  pursuant to conversion of
                  shares of Preferred  Stock shall include shares  designated as
                  Common Stock of the  corporation as of the date of issuance of
                  such  shares  of   Preferred   Stock,   or,  in  case  of  any
                  reclassification of the outstanding shares thereof, the stock,
                  securities or assets provided for in subparagraph (7) above.

         (12)     No  fractional  shares of Common  Stock  shall be issued  upon
                  conversion,  but,  instead of any  fraction  of a share  which
                  would otherwise be issuable,  the corporation shall pay a cash
                  adjustment  in respect of such  fraction in an amount equal to
                  the same  fraction  of the  market  price  per share of Common
                  Stock,  determined pursuant to subparagraph (3)(vii) above, as
                  of the close of business on the day of conversion.

Mandatory  Conversion.  Preferred  Stock shall  automatically  be converted into
shares of Common Stock of the corporation, without any act by the corporation or
the  holders of  Preferred  Stock,  concurrently  with the  closing of the first
public  offering by the corporation of shares of Common Stock of the corporation
registered  under  the  Securities  Act of 1933,  as  amended,  in which (1) the
offering is  underwritten on a firm  commitment  basis by an  underwriter,  or a
group of underwriters represented by an underwriter or underwriters, and (2) the
aggregate  public  offering  price  of  the  securities  sold  for  cash  by the
corporation  in the  offering,  net of expenses  payable by the  corporation  in
connection  with  such  offering,  is at least  $5,000,000,  and (3) the  public
offering  price per share of Common Stock is at least $5 (as adjusted  from time
to time to reflect stock splits, dividends,  recapitalizations,  combinations or
the like).  As used herein,  the term  "closing"  shall mean the delivery by the
corporation  to the  underwriters  of  certificates  representing  the shares of
Common Stock of the  corporation  offered to the public against  delivery to the
corporation by such underwriters of payment therefor.  The term "firm commitment
basis" with respect to the  underwriting  of such public  offering  shall mean a
commitment pursuant to a written  underwriting  agreement under which the nature
of the underwriters' commitment is such that all securities will be purchased by
such  underwriters  if any securities are purchased by such  underwriters.  Each
holder of a share of Preferred  Stock so converted  shall be entitled to receive
the full  number of shares of Common  Stock into  which such share of  Preferred
Stock held by such holder could be converted  if such holder had  exercised  its
conversion  right at the time of  closing  of such  public  offering.  Upon such
conversion,  each  holder  of a  share  of  Preferred  Stock  shall  immediately
surrender such share in exchange for appropriate stock certificates representing
a share or shares of Common Stock of the corporation.

<PAGE>


               ARTICLES OF AMENDMENT OF ARTICLES OF INCORPORATION
                                       OF
                                  DATAKEY, INC.

         Pursuant to the provisions of Minnesota Statutes, Section 302A.135, the
following Amendment of Section 3.01 of the Articles of Incorporation of Datakey,
Inc.  was  adopted  at a meeting of the  shareholders  of the  corporation  duly
convened  and held on the 6th day of May,  1986,  by a vote of 84% of the voting
power of all shares entitled to vote:

                  "3.01 The  aggregate  number of  shares  of stock  which  this
         corporation  shall  have  authority  to  issue  is  12,500,000  shares,
         consisting  of  10,000,000  shares of  Common  Stock,  par value  $.05,
         400,000 shares of Preferred Stock and 2,100,000 undesignated shares." I
         swear  that  the  foregoing  is true and  accurate  and that I have the
         authority to sign this document on
behalf of the corporation.

                                            /s/ John H. Underwood
                                           John H. Underwood, President

STATE OF MINNESOTA         )
                                    )  SS.
COUNTY OF Dakota           )

         The foregoing  instrument was  acknowledged  before me this 25th day of
June,  1986,  by John H.  Underwood,  President  of Datakey,  Inc.,  a Minnesota
corporation, on behalf of the corporation.

                                             /s/ Bette F. Feahr
                                             Notary Public - Minnesota
                                             Dakota County
                                             My commission expires 8-20-91
(Notarial Seal)


<PAGE>


               ARTICLES OF AMENDMENT OF ARTICLES OF INCORPORAT10N
                                       OF
                                  DATAKEY, INC.



         Pursuant to the provisions of Minnesota Statutes, Section 302A.135, the
following  Amendment of the Articles of Incorporation of Datakey,  Inc.,  adding
Article VI, was adopted at a meeting of the shareholders of the corporation duly
convened and held on the May 12, 1987, by a majority vote of the voting power of
all shares entitled to vote:

         "ARTICLE VI - LIMITATION OF DIRECTOR LIABILITY

                  6.1) To the fullest extent permitted by the Minnesota Business
         Corporation  Act as the same  exists or may  hereafter  be  amended,  a
         director  of this  corporation  shall not be  personally  liable to the
         corporation  or its  shareholders  for  monetary  damages for breach of
         fiduciary duty as a director."

         I swear that the  foregoing  is true and  accurate  and that I have the
authority to sign this document on behalf of the corporation.


                                             /s/ John H. Underwood
                                            John H. Underwood, President



STATE OF MINNESOTA         )
                                    )  SS.
COUNTY OF DAKOTA  )

         The foregoing instrument was acknowledged before me this 27 day of May,
1987, by John H. Underwood, President of Datakey, Inc., a Minnesota corporation,
on behalf of the corporation.

                                             /s/ Bette F. Feahr
                                             Notary Public - Minnesota
                                             Dakota County
                                             My commission expires 8-20-91
(Notarial Seal)


<PAGE>


                      Notice of Change of Registered Office
                                       by
                                  DATAKEY, INC.

Pursuant  to  Minnesota  Statutes,  Section  302A.123,  the  undersigned  hereby
certifies that the Board of Directors of the above named  Minnesota  Corporation
has resolved to change the corporation's registered office or agent:

FROM:             Datakey, Inc.
                  12281 Nicollet Avenue South
                  Burnsville, MN  55337

TO:               Datakey, Inc.
                  407 West Travelers Trail
                  Burnsville, MN  55337-2554

The new  address  may not be a post  office  box.  It must be a street  address,
pursuant to Minnesota Statutes, Section 302A.011, Subd. 3.

The effective date of the change will be the 1st day of July, 1987 or the day of
filing of this certificate with the Secretary of State, whichever is later.

I swear that the foregoing is true and accurate and that I have the authority to
sign this document on behalf of the corporation.


                                                     /s/ George H. M. Rountree
                                                     George H. M. Rountree
                                                     Vice President Finance
July 11, 1988

State of Minnesota         )
                           ) ss.
County of Dakota  )

         The foregoing instrument was acknowledged before me on this 11th day of
July, 1988.

                                                   /s/ Bette F. Feahr
                                                   Notary Public - Minnesota
                                                   Dakota County
                                                   My commission expires 8-20-91

State of Minnesota
Department of State
                             Filed: August 10, 1988

<PAGE>


                       STATEMENT OF DESIGNATION OF SHARES
                                       OF
                                  DATAKEY, INC.



         The  undersigned  hereby  certifies that the  resolutions  set forth on
Exhibit A  attached  hereto  were duly  adopted  by the  Board of  Directors  of
Datakey, Inc. on May 11, 1998.

         I swear that the  foregoing  is true and  accurate  and that I have the
authority to sign this document on behalf of the corporation.


May 14, 1998
                                  DATAKEY, INC.


                                 /s/ Alan G. Shuler
                                 Alan G. Shuler
                                 Vice President and Chief Financial Officer




<PAGE>





                                                                    EXHIBIT A


         DESIGNATION OF SERIES A CONVERTIBLE CUMULATIVE PREFERRED STOCK


         WHEREAS, pursuant to the Articles of Incorporation of this corporation,
the  Board  of  Directors  has  authority  to  establish,   from  the  2,100,000
undesignated  shares of capital stock,  one or more classes or series of shares,
to  designate  each such class or  series,  and to fix the  relative  rights and
preferences of each such class or series; and

         WHEREAS,  the Board of Directors deem it advisable to designate  shares
of Series A Convertible Cumulative Preferred Stock;

         NOW,  THEREFORE,  RESOLVED,  that of the 2,100,000  undesignated shares
currently authorized, 150,000 shares are hereby designated as shares of Series A
Convertible Cumulative Preferred Stock, which shares shall have the terms as set
forth on Exhibit A hereto.






<PAGE>


                                    EXHIBIT A


             RIGHTS, PREFERENCES AND RESTRICTIONS OF PREFERRED STOCK


         The rights, preferences, restrictions and other matters relating to the
Series A Convertible Cumulative Preferred Stock (the "Series A Preferred Stock")
are as follows:

         1. Dividend Provisions.  Upon issuance,  dividends shall accrue on each
share of outstanding  Series A Preferred Stock at an annual rate equal to $1.264
per share per annum (8% of the Original Issue Price,  as defined  herein).  Such
dividends  shall be cumulative  and shall be payable upon any  conversion of the
Series A Preferred Stock pursuant to Section 3 hereof. Such dividends shall only
be paid out of legally  available funds of the Company.  Such dividends shall be
payable  by the  Company,  in its  sole  discretion,  all in  cash or all by the
issuance of a number of shares of the Company's  unrestricted,  freely  tradable
common  stock  equal to the  dividends  owing on the Series A  Preferred  Stock;
provided,  however,  that  prior  to the  payment  of any such  dividend  by the
issuance of shares of the Company's  common stock,  the Company shall deliver to
the  Investors an opinion of its counsel  stating that all such shares have been
validly  registered,  and that  they are duly  authorized,  validly  issued  and
nonassessable.  For the purposes  hereof,  the number of shares of the Company's
common stock issuable in lieu of any cash dividend payment shall equal the total
dividend  payment then due divided by the per share price of such stock. The per
share  price of the  Company's  common  stock shall be  determined  based on the
average  closing bid price of such stock  quoted on The Nasdaq  Stock Market for
the ten  consecutive  trading  days  prior  to the  payment  of such  dividends.
Dividends on shares of the Series A Preferred  Stock shall  accrue  beginning on
the date of issuance of the shares of Series A Preferred  Stock,  shall compound
on an  annual  basis  and  shall be  payable  upon  conversion  of the  Series A
Preferred  Stock (a "Payment  Date").  All accrued and unpaid  dividends  on the
Series A Preferred  Stock must be paid before any  dividends  may be declared or
paid on any other  junior  series of  preferred  or common  stock  issued by the
Company.

         2.       Liquidation Preference.

                  (a) In the event of any liquidation, dissolution or winding up
of the Company,  either voluntary or involuntary,  the holders of the previously
issued Convertible  Preferred Stock (the "Convertible  Preferred Stock") and the
Series A Preferred  Stock shall be entitled to receive,  prior and in preference
to any distribution of any of the assets of the Company to the holders of common
stock by reason of their ownership  thereof,  an amount per share equal to $2.50
for the Convertible  Preferred  Stock,  and for the Series A Preferred Stock the
sum of (i) $15.80,  as adjusted  pursuant to Section 4(c) hereof (the  "Original
Issue Price"),  and (ii) an amount equal to cumulative  unpaid dividends on such
shares (respectively, a "Liquidation Amount"). If upon the occurrence of such an
event,  the  assets  and  funds  thus  distributed  among  the  holders  of  the
Convertible   Preferred  Stock  and  the  Series  A  Preferred  Stock  shall  be
insufficient  to  permit  the  payment  to such  holders  of the full  aforesaid
preferential  amounts,  then, the entire assets and funds of the Company legally
available for distribution shall be distributed ratably among the holders of the
Convertible  Preferred  Stock and the Series A Preferred  Stock in proportion to
the amount of such stock owned by each such holder multiplied by the appropriate
Liquidation Amount.


<PAGE>

                  (b)  Upon  the  completion  of the  distribution  required  by
subparagraph  (a) of this  Section  2, if  assets  remain  in the  Company,  the
remaining  assets of the Company shall be distributed  ratably among the holders
of the Company's  common stock and the Series A Preferred Stock in proportion to
the number of shares of common stock held by each (assuming  full  conversion of
all shares of Series A Preferred Stock).

                  (c)  (i)  For  purposes  of  this  Section  2, a  liquidation,
dissolution or winding up of the Company shall be deemed to be occasioned by, or
to include, (A) the acquisition of the Company by another entity by means of any
transaction or series of related  transactions  (including  any  reorganization,
merger or  consolidation  but excluding any merger effected  exclusively for the
purpose  of  changing  the  domicile  of the  Company);  or (B) a sale of all or
substantially   all  of  the  assets  of  the  Company,   unless  the  Company's
shareholders as constituted  immediately prior to such acquisition or sale will,
immediately  after such  acquisition or sale (by virtue of securities  issued as
consideration for the Company's  acquisition or sale or otherwise) hold at least
50% of the voting power of the surviving or acquiring entity.

                       (ii) In any of such events, if the consideration received
by the  Company is other than  cash, its  value will  be deemed  its fair market
value.

                       (iii) In the event the requirements of this Section 2 are
not complied with, the Company shall forthwith either:

                                    (A) cause such closing to be postponed until
such  time  as  the requirements of this Section 2 have been complied with, or

                                    (B) cancel such  transaction, in which event
the  rights,  preferences  and  privileges  of the  holders  of the  Convertible
Preferred Stock and the Series A Preferred Stock shall revert to and be the same
as such rights,  preferences and privileges  existing  immediately  prior to the
date of the first notice referred to in subsection 2(c)(iv) hereof.

                       (iv) The Company  shall  give  each  holder  of record of
Convertible  Preferred  Stock and the Series A Preferred Stock written notice of
such  impending  transaction  not later than 20 days prior to the  shareholders'
meeting called to approve such  transaction,  or 20 days prior to the closing of
such  transaction,  whichever is earlier,  and shall also notify such holders in
writing of the final approval of such transaction;  provided,  however, that the
holder of any shares of then outstanding Convertible Preferred Stock or Series A
Preferred  Stock shall have the right during such 20-day  period to convert such
shares  pursuant to Section 3 hereof.  The first of such notices shall  describe
the  material  terms  and  conditions  of  the  impending  transaction  and  the
provisions of this Section 2, and the Company shall thereafter give such holders
prompt notice of any material  changes.  The transaction  shall in no event take
place sooner than 20 days after the Company has given the first notice  provided
for herein or sooner  than ten days after the  Company  has given  notice of any
material changes provided for herein;  provided,  however, that such periods may
be  shortened  upon  the  written  consent  of the  holders  of the  Convertible
Preferred  Stock and the  Series A  Preferred  Stock that are  entitled  to such
notice rights or similar notice rights and that represent at least a majority of
the  voting  power of all then  outstanding  shares  of each of the  classes  of
preferred stock, voting separately as a class.


<PAGE>

         3.       Conversion.

                  (a)  Conversion  Right.  At the option of the holder  thereof,
each share of Series A Preferred  Stock shall be  convertible at any time during
the period commencing on the day on which the Series A Preferred Stock is issued
and  expiring on May 15, 2000 (the date which is the second  anniversary  of the
date of issuance of the Series A Preferred Stock); provided,  however, that such
expiration  date shall be  extended  for a number of days equal to the number of
days  beyond  the  90th  day  following  the date of  issuance  of the  Series A
Preferred Stock that the Registration  Statement (as such term is defined in the
Registration  Rights  Agreement,  of even  date  herewith,  entered  into by and
between the Company  and the  Investors  set forth on Schedule A thereto) is not
effective (such date,  including any extension thereof pursuant to the foregoing
proviso,  being herein  referred to as the "Second  Anniversary").  The Series A
Preferred  Stock  shall be  convertible  at the  office  of the  Company  or any
transfer  agent for such stock into such number of fully paid and  nonassessable
shares of the  Company's  common stock as is determined by dividing the Original
Issue Price,  subject to adjustment as provided in Section 4, by the  Conversion
Price applicable to such shares,  determined as hereafter provided, in effect on
the  date  the  certificates   representing  such  shares  are  surrendered  for
conversion (the "Conversion  Date").  The Conversion Price shall be equal to the
average  closing bid price of one share of the Company's  common stock as quoted
by the Nasdaq  SmallCap  Market,  the Nasdaq  National  Market or the  principal
exchange upon which shares of the Company's  common stock may be listed,  or, if
the  Company's  common  stock  shall not then be quoted on the  Nasdaq  SmallCap
Market  or the  Nasdaq  National  Market  or  listed  on a  national  securities
exchange, but shall otherwise be traded in the over-the-counter  market, on such
over-the-counter  market for the ten-day  period  ending on the day prior to the
Conversion  Date  (the  "Trading  Period")  multiplied  by .8  (the  "Conversion
Price");  provided,  however, that in no event shall the Conversion Price exceed
$5.00 per share or be less than $2.75 (the "Maximum Price" and "Minimum  Price,"
respectively)  per share; and provided,  further,  that appropriate  adjustments
shall be made in determining the average closing bid price if a recapitalization
or other event  affecting  the  Company's  common  stock shall occur  during the
Trading Period.

                  (b) Dividend Payment. Should the Company,  pursuant to Section
1 hereof,  not elect to pay all  outstanding,  cumulative,  accrued  and  unpaid
dividends  on the Series A Preferred  Stock in shares of its common  stock,  the
Company shall pay, in immediately  available  funds, to the holder of any shares
of Series A Preferred Stock being converted, within two days, all such dividends
on the date that it  receives  notice of such  holder's  intent to convert  such
shares  pursuant to (d) below.  Separately,  should the Company elect to pay all
outstanding,  cumulative, accrued and unpaid dividends on the Series A Preferred
Stock in shares of its  common  stock,  it shall,  within two  business  days of
receiving  a  holder's  notice  of  intent  to  convert,   deliver  certificates
representing such shares to the holder of the Series A Preferred Stock.

                  (c)  Automatic  Conversion.  Any shares of Series A  Preferred
Stock remaining  outstanding on the Second  Anniversary  shall be  automatically
converted pursuant to the conversion terms of Section 3(a) above. The Conversion
Date with respect to such automatic  conversion shall be the Second Anniversary.
In any event,  the  Company  shall,  within two  business  days after  automatic
conversion of the Series A Preferred  Stock,  issue and deliver a certificate or

<PAGE>

certificates  for the number of shares of the  Company's  common  stock to which
each former holder of Series A Preferred Stock is entitled.  Notwithstanding the
foregoing,  no automatic  conversion of the Series A Preferred Stock shall occur
pursuant to this  Section  unless (i) all shares of the  Company's  common stock
underlying  the shares of Series A  Preferred  Stock may be sold  pursuant to an
effective  registration  statement under the Securities Act of 1933, as amended,
(ii) the  Company's  common  stock is listed and  trading  on The  Nasdaq  Stock
Market,  and (iii) the Company has reserved and  available for issuance a number
of shares of its common stock  sufficient to cover conversion of all outstanding
shares of Series A Preferred Stock.

                  (d)  Mechanics  of  Conversion.  Before any holder of Series A
Preferred  Stock  shall be  entitled  to  convert  the same  into  shares of the
Company's  common  stock,  he,  she or it shall  surrender  the  certificate  or
certificates  therefor,  duly  endorsed,  at the office of the Company or of any
transfer agent for the Series A Preferred  Stock, and shall give written notice,
via  facsimile,  to the  Company,  at its  principal  corporate  office,  of the
election to convert the same and shall state  therein the name or names in which
the certificate or certificates  for shares of the Company's common stock are to
be issued. The Company shall,  immediately  thereafter (and in any event no more
than two business days thereafter), issue and deliver to such holder of Series A
Preferred  Stock at the address shown on the Company's  records or at such other
address as such party may designate by written notice to the Company,  or to the
nominee or nominees of such holder, a certificate or certificates for the number
of shares of the  Company's  common stock to which such holder shall be entitled
pursuant  to  Section  3(a) and a  certificate  representing  shares of Series A
Preferred Stock not so converted by the holder.  Such conversion shall be deemed
to have been made  immediately  prior to the close of business on the Conversion
Date, and the person or persons  entitled to receive the shares of the Company's
common stock issuable upon such conversion  shall be treated for all purposes as
the record holder or holders of such shares of the Company's  common stock as of
such date.

                  (e) Mechanics of Automatic Conversion.  On the Conversion Date
with respect to the automatic  conversion pursuant to subsection 3(c) above, the
certificates  representing  shares of Series A Preferred Stock shall immediately
represent  that number of shares of the  Company's  common stock into which such
shares are convertible.  Holders of Series A Preferred Stock shall deliver their
certificates,  duly endorsed in blank,  to the principal  office of the Company,
together  with a  notice  setting  out the name or names  (with  addresses)  and
denominations in which the certificates representing such shares of common stock
issuable  upon  conversion  are to be  issued  and  including  instructions  for
delivery  thereof.  The person  entitled to receive the shares of the  Company's
common stock issuable upon such conversion  shall be treated for all purposes as
the record holder of such shares of common stock at and on the Conversion  Date,
and the rights of such person as a holder of shares of Series A Preferred  Stock
shall cease and  terminate at and on the  Conversion  Date,  in any case without
regard to any failure by such holder to deliver the  certificates  or the notice
required  by this  subsection  3(e).  On the  Conversion  Date with  respect  to
automatic conversion, the Company shall pay all outstanding, cumulative, accrued
and unpaid dividends, either by the issuance of shares of its common stock or in
cash, pursuant to the provisions set forth in (a) above; provided, however, that
should the Company  elect to pay such  dividends by the  issuance of  additional
shares of its common  stock,  the person  entitled to receive such shares of the
Company's  common stock issuable upon such  conversion  shall be treated for all
purposes as the record holder of such additional shares on the Conversion Date


<PAGE>

                  (f) No  Impairment.  The Company will not, by amendment of its
Articles  of  Incorporation  or through  any  reorganization,  recapitalization,
transfer  of  assets,  consolidation,  merger,  dissolution,  issue  or  sale of
securities or any other voluntary action,  avoid or seek to avoid the observance
or performance of any of the terms to be observed or performed  hereunder by the
Company,  but will at all times in good faith  assist in the carrying out of all
the  provisions of this Section 3 and in the taking of all such action as may be
necessary  or  appropriate  in order to  protect  the  conversion  rights of the
holders of the Series A Preferred Stock against impairment.

                  (g) No Fractional Shares. No fractional shares shall be issued
upon the conversion of any share or shares of the Series A Preferred  Stock, and
the number of shares of the Company's common stock to be issued shall be rounded
to the nearest whole share.  Whether or not fractional  shares are issuable upon
such  conversion  shall be determined on the basis of the total number of shares
of Series A Preferred  Stock the holder is at the time converting into shares of
the  Company's  common  stock and the  number of  shares  of such  common  stock
issuable upon such aggregate conversion.

                  (h) Notices of Record Date.  In the event of any taking by the
Company of a record of the holders of any class of securities for the purpose of
determining  the  holders  thereof who are  entitled to receive any  dividend or
other  distribution,  any right to subscribe for,  purchase or otherwise acquire
any  shares of stock of any class or any other  securities  or  property,  or to
receive  any other  right,  the  Company  shall mail to each  holder of Series A
Preferred Stock, at least 20 days prior to the date specified  therein, a notice
specifying  the date on which any such  record is to be taken for the purpose of
such  dividend,  distribution  or right,  and the amount and  character  of such
dividend, distribution or right.

                  (i) Reservation of Stock Issuable Upon Conversion. The Company
shall at all times reserve and keep available out of its authorized but unissued
shares of common stock,  solely for the purpose of effecting  the  conversion of
the shares of the Series A  Preferred  Stock,  such  number of its shares of its
common stock as shall from time to time be sufficient  to effect the  conversion
of all outstanding  shares of the Series A Preferred  Stock;  and if at any time
the number of authorized but unissued shares of the Company's common stock shall
not be sufficient to effect the conversion of all then outstanding shares of the
Series A  Preferred  Stock,  in  addition  to such  other  remedies  as shall be
available to the holder of such Series A Preferred  Stock, the Company will take
such  corporate  action as may, in the opinion of its  counsel,  be necessary to
increase its  authorized  but unissued  shares of common stock to such number of
shares as shall be  sufficient  for such  purposes,  including  engaging in best
efforts to obtain the requisite  shareholder approval of any necessary amendment
to the Company's Articles of Incorporation.

                  (j) Notices.  Any notice  required by the  provisions  of this
Section 3 to be given to the holders of shares of Series A Preferred Stock shall
be deemed given if deposited in the United  States mail,  postage  prepaid,  and
addressed to each holder of record at his,  her or its address  appearing on the
books of the Company.


<PAGE>

         4.       Anti-Dilution Provisions.

                  The Original  Issue Price shall be subject to adjustment  from
time to time upon the happening of any of the following events: (a) In the event
the  Company  shall  issue or sell any  shares of its  common  stock  (except as
provided in paragraph  (e) hereof) for a  consideration  per share less than the
greater of (A) $5.00,  or (B) 80% of the Market Price (as defined  below) on the
date of such issue or sale,  then the Original Issue Price shall be increased to
such greater  price  (calculated  to the nearest cent) as shall be determined by
multiplying the Original Issue Price by a fraction, the numerator of which shall
be the number of shares of the Company's  common stock  outstanding  immediately
after the issuance or sale of such  additional  shares,  and the  denominator of
which shall be the sum of (i) the number of shares of the Company's common stock
outstanding immediately prior to the issuance or sale of such additional shares,
and (ii) the number of shares of the Company's  common stock which the aggregate
consideration  received for the issuance or sale of such additional shares would
purchase at the  greater of $5.00,  or if such  shares of the  Company's  common
stock shall have been issued for a consideration  per share less than 80% of the
Market  Price on the date of issuance or sale,  the current  Market  Price.  For
purposes of this  paragraph,  all shares of the Company's  common stock issuable
upon  exercise  of  outstanding  options  and  warrants  shall be  deemed  to be
outstanding.

                  (b) For the purposes of paragraph  4(a) above,  the  following
subparagraphs (i) to (vii), inclusive, shall be applicable:

                          (i) If at any time the Company shall issue or sell any
rights to  subscribe  for, or any rights or options to  purchase,  shares of its
common stock or any stock or other  securities  convertible into or exchangeable
for such common stock (such  convertible  or  exchangeable  stock or  securities
being hereinafter called "Convertible  Securities"),  whether or not such rights
or options or the right to convert or exchange any such  Convertible  Securities
shall be  immediately  exercisable,  and the price per share for which shares of
the Company's common stock shall be issuable upon the exercise of such rights or
options  or  upon  conversion  or  exchange  of  such   Convertible   Securities
(determined by dividing (1) the total amount,  if any, received or receivable by
the Company as  consideration  for the granting of such rights or options,  plus
the minimum aggregate amount of additional  consideration payable to the Company
upon the  exercise  of such  rights or  options,  plus,  in the case of any such
rights or options  which shall  relate to  Convertible  Securities,  the minimum
aggregate amount of additional consideration,  if any, payable upon the issue or
sale of such Convertible Securities and upon the conversion or exchange thereof,
by (2) the total number of shares of the  Company's  common stock  issuable upon
the exercise of such rights or options or upon the conversion or exchange of all
such  Convertible  Securities  issuable  upon the  exercise  of such  rights  or
options)  shall be less than the  greater  of (x) the  $5.00,  or (y) 80% of the
Market Price at the time of such issue or sale,  then the total number of shares
of the  Company's  common  stock  issuable  upon the  exercise of such rights or
options or upon  conversion or exchange of the total amount of such  Convertible
Securities issuable upon the exercise of such rights or options shall (as of the
date of granting of such rights or options) be deemed to be  outstanding  and to
have been issued for such price per share,  and except as provided in  paragraph
4(d), no further  adjustments of the Original Issue Price shall be made upon the
actual issue of such shares of common stock or of such  Convertible  Securities,
upon the  exercise  of such  rights or options or upon the actual  issue of such
common stock upon conversion or exchange of such Convertible Securities.


<PAGE>

                           (ii) If at any time the  Company  shall issue or sell
any  Convertible  Securities,  whether or not the rights to  exchange or convert
thereunder shall be immediately  exercisable,  and the price per share for which
shares of the Company's  common stock shall be issuable upon such  conversion or
exchange  (determined by dividing (1) the total amount received or receivable by
the  Company  as  consideration  for the  issue  or  sale  of  such  Convertible
Securities,  plus the minimum aggregate amount of additional  consideration,  if
any, payable to the Company upon the conversion or exchange thereof,  by (2) the
total  number  of  shares  of the  Company's  common  stock  issuable  upon  the
conversion or exchange of all such  Convertible  Securities)  shall be less than
the  greater  of (x) $5.00,  or (y) 80% of the Market  Price at the time of such
issue or sale,  then the total  number of shares of the  Company's  common stock
issuable upon conversion or exchange of all such  Convertible  Securities  shall
(as of the date of the issue or sale of such  Convertible  Securities) be deemed
to be outstanding and to have been issued for such price per share,  and, except
as provided in paragraph  4(d),  no further  adjustments  of the Original  Issue
Price shall be made upon the actual  issue of such  shares of common  stock upon
conversion or exchange of such Convertible Securities. In addition, if any issue
or sale of such Convertible Securities shall be made upon exercise of any rights
to subscribe  for or to purchase or any option to purchase any such  Convertible
Securities for which  adjustments of the Original Issue Price shall have been or
shall be made  pursuant  to other  provisions  of this  paragraph  4(b)(ii),  no
further  adjustment of the Original  Issue Price shall be made by reason of such
issue or sale.

                           (iii) If at any time the  Company  shall  declare and
pay a  dividend  or make any other  distribution  upon the  shares of its common
stock  payable  in such  stock or  Convertible  Securities,  any  such  stock or
Convertible Securities, as the case may be, issuable in payment of such dividend
or   distribution   shall  be  deemed  to  have  been  issued  or  sold  without
consideration.

                           (iv)  If at any  time  any  shares  of the  Company's
common  stock or  Convertible  Securities  or any rights or options to  purchase
shares of any such stock or Convertible  Securities  shall be issued or sold for
cash,  the  consideration  received  therefor  shall be deemed to be the  amount
received by the Company therefor,  without  deduction  therefrom of any expenses
incurred or any  underwriting  commissions  or  concessions or discounts paid or
allowed  by the  Company  in  connection  therewith.  In case any  shares of the
Company's  common stock or  Convertible  Securities  or any rights or options to
purchase any such common stock or Convertible Securities shall be issued or sold
for a consideration  other than cash, the amount of the consideration other than
cash  received  by the  Company  shall be  deemed  to be the fair  value of such
consideration  as  determined  by the  Company's  Board  of  Directors,  without
deduction therefrom of any expenses incurred or any underwriting  commissions or
concessions or discounts paid or allowed by the Company in connection therewith.
In case any shares of the Company's  common stock or  Convertible  Securities or
any  rights  or  options  to  purchase  any such  common  stock  or  Convertible
Securities shall be issued in connection with any merger of another  corporation
into the Company, the amount of consideration therefor shall be deemed to be the
fair value of the net assets of such merged  corporation  as  determined  by the
Company's  Board of  Directors  after  deducting  therefrom  all cash and  other
consideration (if any) paid by the Company in connection with such merger.


<PAGE>

                           (v) If at any time the  Company  shall  take a record
of the  holders of its common  stock for the  purpose of  entitling  them (1) to
receive a dividend  or other  distribution  payable  in shares of the  Company's
common stock or in Convertible  Securities,  or (2) to subscribe for or purchase
shares of the Company's common stock or Convertible Securities, then such record
date  shall be deemed  to be the date of the issue or sale of the  shares of the
Company's  common stock deemed to have been issued or sold upon the  declaration
of such  dividend  or the making of such other  distribution  or the date of the
granting of such right of subscription or purchase, as the case may be.

                           (vi) The  number of shares  of the  Company's  common
stock outstanding at any given time shall not include shares owned or held by or
for the account of the Company,  provided  that such shares are neither  issued,
sold or otherwise distributed by the Company.

                           (vii) For purposes  hereof,  the "Market Price" shall
mean the average  closing bid price of the Company's  common stock on the Nasdaq
SmallCap Market, the Nasdaq National Market or the principal exchange upon which
shares of the Company's common stock may be listed,  or, if the Company's common
stock  shall not then be  quoted on the  Nasdaq  SmallCap  Market or the  Nasdaq
National Market or listed on a national securities exchange, but shall otherwise
be traded in the over-the-counter  market, on such  over-the-counter  market, in
each case for the ten day period immediately preceding any determination of such
"Market  Price"  (subject  to  appropriate  adjustments  which  shall be made in
determining the average closing bid price if a  recapitalization  or other event
affecting the Company's common stock shall occur during such 10-day period).  If
at any time  shares of the  Company's  common  stock  shall not be quoted on the
Nasdaq  SmallCap  Market or the  Nasdaq  National  Market,  listed on a national
securities  exchange,  or otherwise traded in the  over-the-counter  market, the
"Market  Price" of a share of the  Company's  common stock shall be deemed to be
the  higher  of (x)  the  book  value  thereof  (as  determined  by any  firm of
independent public accountants of nationally recognized standing selected by the
Company's  Board of  Directors) as of the last day of any month ending within 60
days  preceding  the date of  determination,  or (y) the fair value  thereof (as
determined in good faith by the Company's Board of Directors) as of a date which
shall be within 15 days of the date of determination.

                           (c) In case at any time the  Company shall  subdivide
its  outstanding  shares of common  stock into a greater  number of shares,  the
Original  Issue  Price in  effect  immediately  prior to such  subdivision,  the
Maximum Price and the Minimum Price shall be  proportionately  reduced,  and the
Company shall subdivide the Series A Preferred Stock in the same proportion.  In
case at any time the outstanding  shares of the Company's  common stock shall be
combined  into a smaller  number of shares,  the Original  Issue Price in effect
immediately prior to such  combination,  the Maximum Price and the Minimum Price
shall be proportionately  increased,  and the Company shall combine the Series A
Preferred Stock in the same proportion. Any adjustment under this paragraph 4(c)
shall become  effective at the close of business on the date the  subdivision or
combination shall become effective.  The Company will take such corporate action
as may, in the opinion of its counsel,  be necessary to increase its  authorized
but  unissued  shares of Series A  Preferred  Stock to such  number of shares as
shall be sufficient for any such purposes, including engaging in best efforts to
obtain the  requisite  shareholder  approval of any  necessary  amendment to the
Company's Articles of Incorporation.


<PAGE>

                  (d) If the  purchase or  exercise  price  provided  for in any
right or  option  referred  to in  paragraph  4(b)(i),  or the rate at which any
Convertible  Securities  referred  to in  paragraph  4(b)(i)  or (ii)  shall  be
convertible into or exchangeable for shares of the Company's common stock, shall
change or a different  purchase or exercise price or rate shall become effective
at any  time  or  from  time  to  time  (including  any  change  resulting  from
termination of such right,  option or  convertible  security),  then,  upon such
change  becoming  effective,  the Original Issue Price then in effect  hereunder
shall  forthwith be increased or decreased to such Original Issue Price as would
have been  obtained  had the  adjustments  made upon the granting or issuance of
such rights or options or Convertible Securities been made upon the basis of (A)
the issuance of the number of shares of the Company's  common stock  theretofore
actually  delivered  upon the  exercise  of such  options  or rights or upon the
conversion or exchange of such Convertible  Securities,  and (B) the granting or
issuance at the time of such change of any such options,  rights or  Convertible
Securities then still outstanding for the consideration, if any, received by the
Company therefor and to be received on the basis of such changed price.

                  (e) The Company  shall not be required to make any  adjustment
to the Original Issue Price in the case of:

                           (i)      the granting,  after the date hereof, by the
Company of stock options under the Company's  1997 Stock Option Plan, so long as
the shares of the Company's  common stock underlying such options are covered by
the 800,000  shares  currently  reserved for issuance  under such plan as of the
date hereof,  assuming  approval by the  Company's  shareholders  of the 300,000
share increase at the Company's 1998 Annual Meeting of Shareholders;

                           (ii)   the issuance of shares of the Company's common
stock,  pursuant to the exercise of the options referred to in paragraph 4(e)(i)
above or the  exercise of any other  options or warrants  outstanding  as of the
date hereof; or

                           (iii)  the   issuance  of  shares  of  the  Series  A
Preferred  Stock  hereunder or of shares of the Company's  common stock upon the
conversion of any shares of the Series A Preferred Stock or upon the exercise of
the Warrant or the Warrant issued to Miller,  Johnson & Kuehn,  Incorporated  on
the  same  date  as  the  Preferred  Stock  Purchase  Agreement  to  which  this
certificate of Designation is an Exhibit.

         5. Voting Rights.  The holder of each share of Series A Preferred Stock
shall  have the right to the  number of votes on all  matters  submitted  to the
Company's  shareholders  that  shall be equal to the  number  of  shares  of the
Company's  common  stock into which such  holder's  shares of Series A Preferred
Stock shall then be convertible (assuming a conversion as of the record date set
for the vote).

         6.  Status of  Converted  Stock.  In the  event any  shares of Series A
Preferred Stock shall be converted  pursuant to Section 3 hereof,  the shares of
Series A  Preferred  Stock so  converted  shall be  canceled  and  shall  not be
issuable by the Company.  The Articles of  Incorporation of the Company shall be
appropriately  amended to effect the  corresponding  reduction in the  Company's
authorized capital stock.

         7.  Notice of  Adjustment.  The  Company  shall  provide all holders of
shares of Series A Preferred  Stock five business  days prior written  notice of
any  adjustments  in the Original Issue Price,  the Maximum  Price,  the Minimum
Price or any other adjustments made pursuant to the provisions hereof.

June 11, 1998


Datakey, Inc.
407 West Travelers Trail
Burnsville, Minnesota  55337

RE:      REGISTRATION STATEMENT ON FORM S-3 - EXHIBIT 5.1

Gentlemen/Ladies:

         We  have  acted  as  counsel  for  Datakey,  Inc.  (the  "Company")  in
connection  with the Company's  filing of a  Registration  Statement on Form S-3
(the "Registration Statement") relating to the registration under the Securities
Act of 1933 (the "Act") of an offering  of 896,134  shares of Common  Stock (the
"Shares")  to be  acquired  by  selling  shareholders  of the  Company  upon the
conversion of outstanding  shares of Series A Convertible  Cumulative  Preferred
Stock  (the  "Preferred  Stock") or upon  exercise  of  certain  stock  purchase
warrants (the "Warrants").

         In  connection  with  rendering  this  opinion,  we have  reviewed  the
following:

         1.       The Company's Restated Articles of Incorporation, as amended;

         2.       The Company's Bylaws, as amended;

         3.       Certain corporate  resolutions,  including  resolutions of the
                  Company's Board of Directors pertaining to the issuance by the
                  Company of the shares of Preferred Stock, the Warrants and the
                  Shares;

         4.       The Preferred Stock;

         5.       The Warrants; and

         6.       The Registration Statement.

         Based  upon the  foregoing  and upon  representations  and  information
provided by the Company, we hereby advise you that in our opinion:

         1.       The  Company's  Restated  Articles  of  Incorporation  validly
                  authorize  the issuance of the Shares  registered  pursuant to
                  the Registration Statement.

         2.       Upon exercise or  conversion in accordance  with the terms and
                  conditions of the Preferred  Stock or Warrants,  the Shares to
                  be sold by the selling  shareholders named in the Registration
                  Statement will be validly issued and  outstanding,  fully paid
                  and nonassessable.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" included in the Registration Statement and the related Prospectus.

Very truly yours,

FREDRIKSON & BYRON, P.A.

/s/ Thomas R. King
Thomas R. King, Vice President
Fredrikson & Byron, P.A.
900 Second Ave. S., #1100
Minneapolis, MN 55402
Telephone: (612) 347-7000
Facsimile: (612) 347-7077




                       PREFERRED STOCK PURCHASE AGREEMENT

         This Preferred Stock Purchase  Agreement is made and entered into as of
the 15th day of May, 1998, between Datakey,  Inc., a Minnesota  corporation (the
"Company"),  and those  investors  whose names are listed on Schedule A attached
hereto (collectively, the "Investors").

         For good and valuable consideration,  the receipt and adequacy of which
are hereby  acknowledged  by the Company and the Investors,  the Company and the
Investors agree as follows:

          1.  Sale  and  Purchase  of  Securities.  Subject  to  the  terms  and
conditions  hereof,  the Company  agrees to sell to the Investors at the Closing
(as defined herein), and the Investors agree to purchase from the Company at the
Closing, such shares of the Company's Series A Convertible  Cumulative Preferred
Stock (the "Preferred  Stock") with the rights and  preferences  provided in the
Certificate of Designation for such Preferred Stock attached hereto as Exhibit A
(the  "Certificate  of  Designation")  in the  amounts  set forth in  Schedule A
attached hereto,  and a five-year Warrant in the form attached hereto as Exhibit
B (the  "Warrant")  to purchase  that number of shares of the  Company's  common
stock, $.05 par value per share, set forth in Schedule A at an exercise price of
$6.30 per share. The Preferred Stock and the Warrant are sometimes  collectively
referred to herein as the "Securities."

          2.       Closing.

                   (a)  Closing.  The  closing of the  purchase  and sale of the
Securities  hereunder  shall take place at the  offices of  Leonard,  Street and
Deinard  Professional  Association,   Minneapolis,   Minnesota,  at  1:30  p.m.,
Minnesota  time, on May 15, 1998 or at such other place or different time or day
as may be mutually  acceptable to the Investors and the Company (the "Closing").
At the Closing, the Company will deliver to each Investor a Warrant representing
the right to purchase  that number of shares of the common  stock of the Company
set forth opposite such  Investor's  name on Schedule A attached  hereto,  dated
such Closing date and will deliver to each Investor a  certificate  representing
the number of shares of Preferred  Stock set forth opposite such Investor's name
on Schedule A and each  Investor  shall cause to be  delivered  to the Company a
wire transfer or check  payable to the Company in the amount set forth  opposite
such Investor's name on Schedule A.

          3.  Representations  and  Warranties  by the  Company.  To induce  the
Investors  to enter into this  Agreement  and to purchase  the  Securities,  the
Company hereby represents and warrants to the Investors as follows:

                   (a)  Disclosure.  The Company has provided the Investors with
all the  information  it has  requested  in  deciding  whether to  purchase  the
Securities and all information the Company  believes is necessary or appropriate
relating to an investment in the Company.  There are no facts which individually
or in the aggregate materially adversely affect the business,  assets, financial
condition or prospects of the Company,  except as set forth in this Agreement or
any other written statements  delivered in connection with this Agreement.  This
Agreement and the other  written  information  delivered in connection  with the
transactions  contemplated herein  (collectively,  the "Disclosed  Information")

<PAGE>

fairly  presents all material  information  regarding the Company as of the date
hereof and, as of the date of the Closing,  the Disclosed  Information  will (i)
fairly  present all material  information  regarding  the Company,  and (ii) not
include any untrue  statement  of a material  fact or omit to state any material
fact required to be stated therein or necessary to make the  statements  therein
not misleading.

                   (b)  Organization,  Good  Standing,  Etc. The Company is duly
incorporated  and validly  existing as a corporation  in good standing under the
laws of the State of Minnesota,  with power and authority to own its  properties
and conduct its  business as now  conducted  and proposed to be  conducted.  The
Company is duly qualified to do business as a foreign corporation and is in good
standing in all states or  jurisdictions  in which the ownership or lease of its
property or the conduct of its  business  requires  such  qualification  and the
failure to be so qualified would have a material adverse effect on the Company's
business. The Company has one subsidiary.

                   (c) Financial Statements. The financial statements (including
all related  schedules and notes) included in the Disclosed  Information  fairly
represent the financial condition and results of operations of the Company as of
the dates and for the periods  indicated;  such statements have been prepared in
accordance with generally accepted accounting  principles  consistently  applied
throughout  the  periods  indicated;  and the  report of the  public  accountant
included  in the  Disclosed  Information  is  issued  by an  independent  public
accountant within the meaning of the Securities Exchange Act of 1934, as amended
(the "Exchange Act"), and the rules and regulations thereunder.

                   (d)  Authorization and  Enforceability.  The Company has full
legal  power,  right  and  authority  to  enter  into  this  Agreement  and  the
Registration  Rights Agreement among the Company and the Investors,  the form of
which is attached hereto as Exhibit E (the "Registration  Rights Agreement") and
to issue the Securities.  This Agreement,  the Registration Rights Agreement and
the Securities,  have been duly authorized,  executed and delivered on behalf of
the  Company  and  are  the  valid  and  binding  obligations  of  the  Company,
enforceable  in  accordance  with  their  respective  terms and  subject,  as to
enforcement, to applicable bankruptcy,  insolvency,  reorganization,  moratorium
and other laws affecting the rights of creditors  generally,  to the exercise of
judicial  discretion  as to the  availability  of  equitable  remedies  such  as
specific  performance  and  injunction  and subject,  as to  enforcement  of the
indemnification provisions, to limitations under applicable securities laws. The
Securities  when  delivered  pursuant  to the  terms of this  Agreement  will be
validly issued, fully paid and nonassessable.

                   (e) License  and  Approvals.  The  Company has all  licenses,
certificates,  permits and other  approvals  from  governmental  and  regulatory
authorities  necessary for the conduct of its business as it is currently  being
conducted  and as proposed to be  conducted  except those which would not have a
material adverse effect or the Company if not obtained.

                   (f) Intellectual  Property. The Company owns or possesses all
assets,  patents, patent applications,  trademarks,  service marks, trade names,
trademark  registrations,  service  mark  registrations,  copyrights,  licenses,
inventions,  trade secrets and rights  necessary for the conduct of its business

<PAGE>

as it is currently  being  conducted and as proposed to be conducted and has not
received any notice of conflict  with the  asserted  rights of others in respect
thereof. To the best of the Company's knowledge,  no name which the Company uses
and no other aspect of the business of the Company involves or gives rise to any
infringement   of,  or  license  or  similar  fees  for,  any  patents,   patent
applications,  trademarks,  service marks, trade names, trademark registrations,
service mark registrations,  copyrights,  licenses, inventions, trade secrets or
other similar rights of others.

                   (g)  Defaults.  The  Company  is not in  breach,  default  or
violation of, and the execution of this  Agreement and the  Registration  Rights
Agreement  and  the  consummation  of  the   transactions   herein  and  therein
contemplated will not conflict with or result in any breach of, any of the terms
or conditions of, or constitute a default or violation  under,  (i) the Articles
of Incorporation,  as amended, or Bylaws, as amended,  of the Company,  (ii) any
indenture, agreement or other instrument to which the Company is now a party, or
(iii) to the best of the  Company's  knowledge,  any law or any  order,  rule or
regulation  applicable  to the  Company of any court or of any  federal or state
regulatory body or administrative agency having jurisdiction over the Company or
its property.

                   (h) Consents. No consent, authorization,  approval, permit or
order of or filing with any  governmental  or  regulatory  authority is required
under current laws and regulations in connection with the execution and delivery
of this Agreement or the Registration  Rights Agreement or the offer,  issuance,
sale or delivery of the Securities,  other than the  qualification  thereof,  if
required,  under applicable state securities laws, which  qualification has been
or will  be  effected  as a  condition  of the  sale  of the  Securities  to the
Investors.  The  Company  has not,  directly  or through an agent,  offered  the
Securities  or any similar  securities  for sale to, or solicited  any offers to
acquire  such  securities  from,  persons  other than the  Investors.  Under the
circumstances  contemplated by this  Agreement,  the offer,  issuance,  sale and
delivery of the Securities will not, under current laws and regulations, require
compliance  with the prospectus  delivery or  registration  requirements  of the
Securities Act of 1933, as amended (the "Securities Act"). The Company has filed
all  reports  or other  documentation  that it is  required  to file  under  the
Exchange Act, any rules or regulations  promulgated  thereunder,  the applicable
rules and regulations of the National Association of Securities Dealers ("NASD")
and all applicable state securities laws, and the information  contained in such
reports or other documents did not make any untrue  statement of a material fact
or omit to state a  material  fact  necessary  in  order to make the  statements
therein made, in the light of the circumstances  under which they were made, not
misleading.

                   (i) Valid Issuance of Preferred  Stock.  The Preferred Stock,
when authorized,  issued, sold and delivered in accordance with the terms hereof
will be duly and validly issued,  fully paid and  nonassessable and will be free
of restrictions on transfer other than under this Agreement,  and, based in part
upon the  representations of the Investors in this Agreement,  will be issued in
compliance with federal and state  securities laws. The Company has a sufficient
number of  shares of  Preferred  Stock  authorized  and  reserved  for  issuance
pursuant to the provisions of Section 4(c) of Exhibit A attached hereto.


<PAGE>

                   (j)  Valid  Issuance  of  Common  Stock.  The  shares  of the
Company's  common stock issuable upon conversion of the Preferred Stock and upon
exercise of the Warrant have been  reserved for  issuance  and,  when issued and
delivered in accordance with the terms thereof, will be duly authorized, validly
issued,  fully paid and  non-assessable,  shall be free of any  pledges,  liens,
encumbrances  and  restrictions,  and  will be  issued  in  compliance  with all
applicable federal and state securities laws.

                   (k) Litigation/Proceedings.  There are no pending, threatened
or, to the Company's  knowledge,  contemplated  actions,  suits,  proceedings or
investigations before or by any court or governmental agency, authority or body,
or any  arbitrator,  which  are not  ordinary,  routine  and  incidental  to the
business of the Company or which might result in any material  adverse change in
the business condition (financial and other) or properties of the Company.

                   (l)  Capital  Stock.  The  authorized  capital  stock  of the
Company consists of 12,500,000 shares,  including the following:  (a) 10,000,000
shares of common stock,  of which 2,909,735  shares are issued and  outstanding;
(b) 400,000 shares of convertible  preferred  stock, of which 150,000 shares are
issued and  outstanding;  (c) 150,000 shares of Series A Convertible  Cumulative
Preferred Stock; and (d) 1,950,000  undesignated shares. Except for an aggregate
of 765,333 shares of the Company's common stock which are subject to outstanding
options to employees under the Company's  various stock option plans,  there are
no  outstanding  rights to acquire  from the  Company  any shares of its capital
stock.  All  outstanding  shares of the  Company's  capital stock have been duly
authorized,  validly issued,  fully paid and  nonassessable and have been issued
pursuant  to  valid   registrations   under,  or  valid   exemptions  from,  the
registration  requirements of the Securities Act and appropriate  state blue sky
laws.

                   (m) Title to Properties.  The Company has good and marketable
title,  free and  clear of all  liens,  encumbrances  and  equities,  and of all
charges or claims,  to all of the real and personal property owned by it, except
liens,  encumbrances and equities, and charges or claims, which are not material
and do not  materially  affect the value of such property or interfere  with the
conduct of the Company's  business.  The Company has valid and binding leases to
all of the real and personal property  necessary for the conduct of its business
with such  exceptions  as do not  materially  interfere  with the conduct of its
business.

                   (n) Tax Returns. The Company has filed all necessary federal,
state and foreign income, franchise and other tax returns and has paid all taxes
shown  as due  thereon,  and the  Company  has  received  no  notice  of any tax
deficiency which has been asserted against the Company.

                   (o)  Authority.  The  Company  has all  requisite  power  and
authority  to  issue,  sell and  deliver  the  Preferred  Stock and  Warrant  in
accordance with and upon the terms set forth in this Agreement.  The Company has
duly taken all required action for the due and proper  authorization,  issuance,
sale and delivery of the Preferred  Stock and Warrant.  No preemptive  rights or
other  rights of  subscription,  first  refusal  or similar  rights of  security
holders of the  Company  exist  with  respect  to the  issuance  and sale of the
Preferred Stock and Warrant by the Company or the shares of the Company's common
stock issuable upon  conversion and exercise,  respectively,  thereof.  With the

<PAGE>

exception  of the  holder of the  Convertible  Preferred  Stock (as such term is
defined  in  Exhibit A  attached  hereto),  no  security  holder of the  Company
possesses any registration rights. The issuance of the Securities and the shares
of the Company's  common stock  underlying the Securities will not result in the
issuance  of  any  additional  shares  of  the  Company's  common  stock  or the
triggering of other  anti-dilution  or similar rights  contained in any options,
warrants or other securities issued by, or agreements of, the Company.

                   (p) Investment  Company.  In retaining and using the proceeds
from the sale of the Securities, the Company will not be required to register as
an "Investment Company" under the Investment Company Act of 1940, as amended.

                   (q) Bad Boy  Certification.  Neither the Company,  any of its
predecessors,  any  affiliated  issuer  nor  any  of  the  Company's  directors,
officers, beneficial owners of 10% or more of any class of its equity securities
or other  affiliates  nor any  promoter  of the Company is subject to any of the
disabilities  enumerated  in  Exhibit  C  hereto  and  the  representations  and
warranties contained therein are true and correct.

                   (r) Fees and  Commissions.  Other than pursuant to agreements
with  Miller,  Johnson & Kuehn,  Incorporated,  the Company has not incurred any
liability  for any finder's or broker's fee or agent's  commission in connection
with the execution  and delivery of this  Agreement or the  consummation  of the
transactions contemplated hereby.

                   (s)  Changes,  Dividends,  Etc.  Except for the  transactions
contemplated  by this  Agreement,  since the date of the most  recent  financial
statements  of the Company  provided  to  Investors,  the  Company has not:  (i)
incurred any debts, obligations or liabilities,  absolute, accrued or contingent
and whether due or to become due,  except  current  liabilities  incurred in the
ordinary  course of business which  (individually  or in the aggregate) will not
materially  and adversely  affect the  business,  properties or prospects of the
Company;  (ii) paid any  obligation  or liability  other than,  or discharged or
satisfied  any  liens  or  encumbrances  other  than  those  securing,   current
liabilities,  in each case in the ordinary course of business; (iii) declared or
made any payment to or  distribution  to its  shareholders  as such,  or used or
redeemed any of its shares of capital stock, or obligated  itself to do so; (iv)
mortgaged,  pledged or subjected  to lien,  charge,  security  interest or other
encumbrance  any of its assets,  tangible or intangible,  except in the ordinary
course of business;  (v) sold, transferred or leased any of its assets except in
the ordinary course of business; (vi) suffered any physical damage,  destruction
or loss (whether or not covered by insurance) materially and adversely affecting
the tangible properties, business or prospects of the Company; (vii) encountered
any labor  difficulties or labor union organizing  activities;  (viii) issued or
sold any shares of capital  stock or other  securities  or granted  any  options
other than to employees, warrants, or other purchase rights with respect thereto
other than pursuant to this Agreement;  (ix) made any acquisition or disposition
of any material  assets or became  involved in any other  material  transaction,
other than for fair value in the ordinary  course of business;  or (x) agreed to
do any of the foregoing other than pursuant  hereto.  There has been no material
adverse change in the financial condition,  operations, results of operations or
business of the Company since the date of the most recent  financial  statements
of the Company provided to the Investors.


<PAGE>

                   (t)  Reporting.  The  Company  is  subject  to the  reporting
requirements of the Securities Act and the Exchange Act and (i) has timely filed
all reports and statement required to be filed thereunder in the 12-month period
prior to the date  hereof,  and (ii)  each  report  and  statement  was true and
complete in all material respects when filed.

          4.  Representations  of the  Investors.  Each Investor  represents for
itself that:

                    (a) Investment  Intent. The Securities being acquired by the
Investor are being  purchased for  investment for the Investor's own account and
not with the view to, or for resale in  connection  with,  any  distribution  or
public offering thereof.  The Investor  understands that the Securities have not
been registered  under the Securities Act or any state securities laws by reason
of their  contemplated  issuance in a transaction  exempt from the  registration
requirements  of the Securities Act and applicable  state  securities  laws, and
that the reliance of the Company upon these  exemptions  is  predicated  in part
upon this representation by the Investor.  The Investor further understands that
the  Securities,  and the shares of the  Company's  common stock  issuable  upon
conversion or exercise  thereof,  may not be  transferred  or resold without (i)
registration  under the Securities Act and any applicable state securities laws,
or (ii) an exemption from the  requirements of the Securities Act and applicable
state securities laws.

                    (b)  Location  of  Principal  Office,  Qualification  as  an
Accredited Investor,  Etc. The state in which the Investor's principal office is
located is the State set forth in the Investor's  address on Schedule A attached
hereto.  The  Investor  qualifies  as an  accredited  investor  for  purposes of
Regulation D promulgated  under the  Securities  Act. The Investor  acknowledges
that the Company has made  available to the Investor at a reasonable  time prior
to the execution of this Agreement the  opportunity to ask questions and receive
answers  concerning  the  business  and affairs of the Company and the terms and
conditions  of the sale of  Securities  contemplated  by this  Agreement  and to
obtain any additional  information  (which the Company  possesses or can acquire
without  unreasonable  effort or  expense)  as may be  necessary  to verify  the
accuracy of information  furnished to the Investor.  The Investor (i) is able to
bear the loss of its entire  investment in the  Securities  without any material
adverse  effect on its  business,  operations  or  prospects,  and (ii) has such
knowledge and experience in financial and business matters that it is capable of
evaluating  the merits and risks of the  investment to be made by it pursuant to
this Agreement.

                    (c) Acts  and  Proceedings.  This  Agreement  has been  duly
authorized  by all necessary  action on the part of the Investor,  has been duly
executed and delivered by the Investor,  and is a valid and binding agreement of
the Investor.

          5. Conditions of the Investors' Obligation. The obligation to purchase
and pay for the Securities at the Closing is subject to the fulfillment prior to
or on the Closing  date of the  conditions  set forth in this  Section 5. In the
event that any such  condition  is not  satisfied  to the  satisfaction  of each
Investor, then the Investors shall not be obligated to proceed with the purchase
of the Securities at the Closing.


<PAGE>

                   (a) Representations  and Warranties.  The representations and
warranties  of the Company under this  Agreement  shall be true on and as of the
Closing date with the same effect as though made on and as of the Closing date.

                   (b)  Compliance  with  Agreement.   The  Company  shall  have
performed  and  complied  with all  agreements  or  conditions  required by this
Agreement to be performed  and complied with by it prior to or as of the Closing
date.

                   (c) Certificate of Officers. The Company shall have delivered
to the  Investors  a  certificate,  dated  the  Closing  date,  executed  by the
President and the Chief Financial Officer of the Company,  and certifying to the
satisfaction of the conditions specified in Sections 5(a) and 5(b).

                   (d) Opinion of the Company's  Counsel.  The  Investors  shall
have  received  from  Fredrikson  & Byron,  P.A.,  counsel for the  Company,  an
opinion, dated the Closing date, in the form attached hereto as Exhibit D.

                   (e) Supporting  Documents.  The Investors shall have received
the following:

                            (i)      A copy of the  resolutions of  the Board of
Directors of the Company  certified by the Secretary of the Company  authorizing
and approving the  execution,  delivery and  performance  of this  Agreement and
issuance of the Securities;

                            (ii)     A  certificate  of  incumbency executed  by
the Secretary of the Company certifying the names,  titles and signatures of the
officers  of the  Company  authorized  to execute  this  Agreement  and  further
certifying  that  the  Articles  of  Incorporation  and  Bylaws  of the  Company
delivered to the Investors at the time of the execution of this  Agreement  have
been validly adopted and have not been amended or modified; and

                            (iii) A copy of the  Articles of  Incorporation  and
Bylaws  of  the  Company  as  of  such  date  and  such  additional   supporting
documentation   and  other   information   with  respect  to  the   transactions
contemplated hereby as the Investors may reasonably request.

                   (f)   Qualification   Under  State   Securities   Laws.   All
registrations,  qualifications,  permits and approvals required under applicable
state  securities  laws for the lawful  execution and delivery of this Agreement
and the offer, sale, issuance and delivery of the Securities to the Investors at
the Closing shall have been obtained.

                   (g)  Proceeding  and  Documents.   All  corporate  and  other
proceedings and actions taken in connection with the  transactions  contemplated
hereby and all  certificates,  opinions,  agreements,  instruments and documents
mentioned  herein or incident to any such  transaction  shall be satisfactory in
form and substance to the Investors.

                   (h) File Certificate of Designation.  It shall be a condition
to the Investors' obligation to close the transactions  contemplated hereby that
the Company have filed the  Certificate  of  Designation  with the  Secretary of
State of the State of Minnesota and that such  certificate  be accepted and duly
filed by such Secretary's office.


<PAGE>

                   (i) Execution of Registration Rights Agreement. It shall be a
condition to the Investors'  obligation to close the  transactions  contemplated
hereby that the Company  execute and deliver to the Investors  the  Registration
Rights Agreement attached hereto as Exhibit E.

          6.  Affirmative  Covenants of the Company.  The Company  covenants and
agrees as follows:

                   (a)  Corporate  Existence.  The  Company  will  maintain  its
corporate  existence in good  standing and comply with all  applicable  laws and
regulations  of the  United  States  or of any  state or  political  subdivision
thereof and of any government  authority where failure to so comply would have a
material adverse impact on the Company or its business or operations.

                   (b) Books of Accounts.  The Company will keep books of record
and  account in which  full,  true and  correct  entries  are made of all of its
respective dealings, business and affairs, in accordance with generally accepted
accounting principles.  The Company will employ certified public accountants who
are  "independent"  within the  meaning  of the  accounting  regulations  of the
Securities and Exchange Commission.

                   (c) Patents and Other  Intangible  Rights.  The Company  will
apply  for,  or  obtain  assignments  of,  or  licenses  to  use,  all  patents,
trademarks,  trade  names and  copyrights  which in the opinion of a prudent and
experienced  businessperson  operating  in the  industry in which the Company is
operating  are  desirable or  necessary  for the conduct and  protection  of the
business of the Company.

                   (d) Certain Information.  For a period of five years from the
date hereof,  the Company will furnish to the Investors (i) within 90 days after
the end of each fiscal year, a copy of the Company's annual report on Form 10-K,
including  audited financial  statements,  together with a report thereon of its
independent public accountant;  (ii) within 45 days after the end of each of the
first three quarters of each fiscal year, the Company's quarterly report on Form
10-Q,  including quarterly condensed  financial  statements of the Company;  and
(iii) as soon as practicable  after filing,  any other report or statement filed
by the Company under the Securities Act or the Exchange Act. The requirements of
this  Section  will be met with  respect  to a  particular  form if such form is
available to the  Investors  in  electronic  format on the  Internet  within the
periods specified above for such form.

                   (e) Timely Filings.  The Company will timely file all reports
and statements to be filed by the Company pursuant to the reporting requirements
of the  Securities  Act and the Exchange Act and each such report and  statement
will be true and complete in all material respects when filed.

                   (f)  Indemnification.  The Company  will  indemnify  and hold
harmless  the  Investors  and each person,  if any,  who controls the  Investors
within the  meaning of the  Securities  Act,  from and against any and all loss,
damage,  liability,  cost  and  expense  to  which  the  Investors  or any  such
controlling  person  may  become  subject,  insofar  as  such  losses,  damages,

<PAGE>

liabilities, costs or expenses are caused by (i) any untrue statement or alleged
untrue statement of any material fact contained  herein,  or arise out of or are
based upon the  omission  or alleged  omission to state  herein a material  fact
required to be stated  herein or necessary  to make the  statements  herein,  in
light of the circumstances in which they were made, not misleading,  or (ii) any
breach of any  representation,  warranty or agreement of the Company  hereunder;
provided,  however,  that the Company will not be liable in any such case to the
extent that a court of competent  jurisdiction  shall have determined by a final
judgment that such loss, damage, liability, cost or expense resulted exclusively
from actions taken or omitted to be taken by the  Investors or such  controlling
person due to their, his or her gross negligence,  bad faith, willful misconduct
or breach of this Agreement. Promptly after receipt by the Investors pursuant to
this Section of notice of the  commencement of any action  involving the subject
matter of the foregoing  indemnity  provisions,  the Investors  will, if a claim
thereof is to be made  against the Company  pursuant to the  provisions  hereof,
promptly notify the Company of the commencement  thereof; but the omission to so
notify the Company will not relieve it from any  liability  which it may have to
the Investors  otherwise than hereunder.  In case such action is brought against
the  Investors  and they notify the  Company of the  commencement  thereof,  the
Company shall have the right to  participate  in, and, to the extent that it may
wish, to assume the defense thereof, with counsel satisfactory to the Investors;
provided,  however,  if the  defendants in any action include both the Investors
and the Company and there is a conflict of interest which would prevent  counsel
for the Company from also  representing the Investors,  the Investors shall have
the right to select separate  counsel for  participation  in the defense of such
action  on  behalf  of the  Investors.  After  notice  from the  Company  to the
Investors of its election so to assume the defense thereof, the Company will not
be liable to the  Investors  pursuant to the  provisions of this Section for any
legal or other expense subsequently incurred by the Investors in connection with
the defense thereof other than reasonable costs of investigation, unless (i) the
Investors  shall have  employed  counsel in  accordance  with the proviso of the
preceding   sentence,   (ii)  the  Company  shall  not  have  employed   counsel
satisfactory  to the Investors to represent  the  Investors  within a reasonable
time after the notice of the  commencement  of the action,  or (iii) the Company
has authorized the employment of counsel for the Investors at the expense of the
Company.

                   (g) Fees of Counsel.  At the Closing,  the Company  shall pay
the fees and expenses of legal  counsel to the Investors as well as the fees and
expenses of counsel to Miller,  Johnson & Kuehn,  Incorporated  ("MJK") incurred
through the date of the Closing. In addition,  at the Closing, the Company shall
pay MJK 7% of the Purchase  Price and shall issue MJK a warrant to purchase that
number of shares of the  Company's  common  stock  equal to 10% of the number of
shares of the Company's  common stock issuable upon  conversion of the Preferred
Stock  sold  by the  Company  to the  Investors  at the  Closing,  assuming  the
conversion of the Preferred Stock on the date of Closing.  The exercise price of
MJK's  warrant  shall be 110% of the closing bid price of the  Company's  common
stock on the day prior to Closing.

                   (h)  Reservation  of Shares.  The Company will, at all times,
reserve and keep available (i) authorized and unissued shares of Preferred Stock
sufficient  for  issuance  pursuant  to the terms of  Section  4(c) of Exhibit A
attached  hereto,  and (ii)  authorized and unissued  shares of its common stock
sufficient for issuance upon  conversion of the Preferred  Stock and exercise of
the Warrant.


<PAGE>

          7.    Restriction on Transfer of  Preferred Stock, Warrant and Shares.

                   (a) Legend. Each share of Preferred Stock, each Warrant,  and
each  certificate  representing  shares of the  Company's  common stock shall be
endorsed with a legend in substantially the form which follows:

          "The securities represented by this certificate may not be transferred
         without (i) the  opinion of counsel  satisfactory  to this  corporation
         that such transfer may lawfully be made without  registration under the
         Securities Act of 1933, as amended, and all applicable state securities
         laws, or (ii) such registration."

                   (b) Removal of Legend.  Any legend  endorsed on a certificate
evidencing a security pursuant to Section 7(a) hereof shall be removed,  and the
Company  shall  issue a  certificate  without  such legend to the holder of such
security, if such security is being disposed of pursuant to a registration under
the Securities Act or pursuant to Rule 144 or any similar rule then in effect or
if such holder  provides the Company with an opinion of counsel  satisfactory to
the Company to the effect that a transfer of such  security  may be made without
registration.  In  addition,  if the  holder of such  security  delivers  to the
Company an opinion of such counsel to the effect that no subsequent  transfer of
such security will require  registration  under the Securities  Act, the Company
will  promptly  upon  such   contemplated   transfer  deliver  new  certificates
evidencing such security that do not bear the legend set forth in Section 7(a).

          8.       Miscellaneous.

                   (a) Changes,  Waivers,  Etc.  Neither this  Agreement nor any
provisions hereof may be changed,  waived,  discharged or terminated orally, but
only by a statement in writing, signed by the party against which enforcement of
the change, waiver, discharge or termination is sought.

                   (b)  Notices.  All  notices,  requests,  consents  and  other
communications  required or permitted hereunder shall be in writing and shall be
delivered,  or mailed first-class postage prepaid,  registered or certified mail
or shall be sent by facsimile transmission followed by mailed copy:

                          if  to the  Investors at  their  respective  addresses
set forth on Schedule  A, or at such other  address or  facsimile  number as any
Investor may specify in writing to the Company; or

                          if to the Company at Datakey, Inc., 407 West Travelers
Trail, Burnsville, Minnesota 55337, Attention: President, facsimile number (612)
890-2726;  or at such  other  address or  facsimile  number as the  Company  may
specify by written notice to the Investors;


<PAGE>

                          and such  notices and other  communications  shall for
all  purposes of this  Agreement  be treated as being  effective  or having been
given if delivered  personally,  if sent by mail, when received,  or, if sent by
facsimile,  upon the sender's receipt of confirmation from its facsimile machine
of transmission.

                   (c)  Survival  of   Representations   and   Warranties.   All
representations and warranties and agreements contained herein shall survive the
execution and delivery of this Agreement,  any investigation at any time made by
the Investors or on its behalf,  and the sale and purchase of the Securities and
payment  therefor.  All statements  contained in any certificate,  instrument or
other  writing  delivered  by or on  behalf  of the  Company  pursuant  to  this
Agreement   (other  than  legal  opinions)  at  the  Closing  shall   constitute
representations and warranties by the Company hereunder.

                   (d) Headings.  The headings of the sections of this Agreement
have been inserted for  convenience  of reference  only and do not  constitute a
part of this Agreement.

                   (e)  Choice of Law.  The laws of the state of New York  shall
govern the validity of this  Agreement,  the  construction  of its terms and the
interpretation  of the rights and duties of the parties  hereunder.  Each of the
Company and the Investors  irrevocably consent to the exclusive  jurisdiction of
the United States Federal  courts and state courts,  located in New York County,
New York, in any suit or proceeding  relating to, based on or arising under this
Agreement  and  irrevocably  agree  that all  claims in  respect of such suit or
proceeding may be determined in such courts. The Company  irrevocably waives the
defense of an inconvenient  forum to the maintenance of such suit or proceeding.
Service of process on the Company  mailed by first class mail shall be deemed in
every respect  effective service of process upon the Company in any such suit or
proceeding.  Nothing  herein  shall  affect the right of any  Investor  to serve
process in any manner permitted by law.

                   (f) Counterparts. This Agreement may be executed at different
times  and in two or more  counterparts,  each  of  which  shall  be  deemed  an
original,  but  all  of  which  together  shall  constitute  one  and  the  same
instrument.

                   (g) Parties in Interest. All the terms and provisions of this
Agreement  shall be binding upon and inure to the benefit of and be  enforceable
by the  respective  successors  and  assigns of the parties  hereto,  whether so
expressed  or not,  and,  in  particular,  shall  inure to the benefit of and be
enforceable by the holder or holders from time to time of any of the Securities.

                   (h)  Entire   Agreement.   This   Agreement,   including  and
incorporating  all Exhibits and Schedules  hereto,  constitutes and contains the
entire agreement and  understanding of the parties  regarding the subject matter
of this Agreement and supersedes any and all prior negotiations, correspondence,
understandings  and agreements,  written or oral, among the parties with respect
to the subject matter hereof.



<PAGE>


         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed  by their  duly  authorized  representatives  as of the date  indicated
above.

Datakey, Inc.                      Special Situations Private Equity Fund, L.P.:


By:  /s/ Alan Shuler                        By: /s/ David Greenhouse
Its: Chief Financial Officer                Its:
                                            Tax Identification Number: 

Special Situations Technology Fund, L.P.:   Robert G. Allison

By: /s/ David Greenhouse                    By: /s/ Richard C. Perkins
Its:                                        Attorney-in-Fact
Tax Identification Number:                Tax Identification Number: 


Shirley A. Baxter, TTEE
FBO Shirley A. Baxter Revocable             Craig L. Campbell
Trust U/A DTD 7-3-96

By: /s/ Richard C. Perkins                  By: /s/ Richard C. Perkins
Attorney-in-Fact                            Attorney-in Fact
Tax Identification Number:                  Tax Identification Number: 


Piper Jaffray as Custodian FBO Bradley      Piper Jaffray as Custodian
A. Erickson IRA 480-263177-102              FBO Richard C. Perkins

By: /s/ Richard C. Perkins                  By: /s/ Richard C. Perkins
Attorney-in-Fact                            Attorney-in Fact
Tax Identification Number: 41-1422918     Tax Identification Number:  41-1422918

David M. Westrum, TTEE
FBO David M. Westrum
Revocable Living Trust                      Pyramid Partners, L.P.
U/A DTD 6-1-97

By: /s/ Richard C. Perkins                  By: /s/ Richard C. Perkins
Attorney-in-Fact                            Attorney-in Fact
Tax Identification Number:                  Tax Identification Number: 



<PAGE>


Industricorp & Co., Inc.                    Daniel S. & Patricia M. Perkins JT
FBO Twin City Carpenters Pension Plan

 /s/ Karen McKernan                         /s/ Daniel S. Perkins
By:  Union Bank & Trust,                    Daniel S. Perkins
Its  Officer                                /s/ Patrice M. Perkins
                                            Patrice M. Perkins
                                          Tax Identification Number: 
Gary Kohler IRA

/s/ Gary S. Kohler
By:  Gary Kohler


<PAGE>



                                  Schedule A-2
                                   SCHEDULE A


                                    INVESTORS
<TABLE>
<CAPTION>

Names and Address                              Preferred Shares           Warrant Shares              Amount ($)
<S>                                                 <C>                      <C>                     <C>        
Special Situations Private Equity                   58,544                   110,119                 $924,995.20
Fund, L.P.
153 East 53rd Street
51st Floor
New York, New York 10022

Special Situations Technology Fund,                 15,823                    29,763                 $250,003.40
L.P.
153 East 53rd Street
51st Floor
New York, New York 10022

Gary Kohler IRA                                      1,583                     2,978                  $25,011.40

Robert G. Allison                                    1,265                     2,379                  $19,987.00

Shirley A. Baxter, TTEE FBO Shirley                  1,265                     2,379                  $19,987.00
A. Baxter Revocable Trust
U/A DTD 7-3-96

Craig L. Campbell                                    1,265                     2,379                  $19,987.00

Piper Jaffray as Custodian FBO                       1,265                     2,379                  $19,987.00
Bradley A. Erickson
IRA 480-263177-102

Piper Jaffray as Custodian FBO                       1,265                     2,379                  $19,987.00
Richard C. Perkins
IRA 980-576-905-610

David M. Westrum TTEE                                1,265                     2,379                  $19,987.00
FBO David M. Westrum
Revocable Living Trust
U/A DTD 6-1-97

Pyramid Partners L.P.                                4,460                     8,389                   70,468.00

Industricorp & Co., Inc.                            10,000                    18,810                 $158,000.00
FBO Twin City Carpenters Pension Plan

Daniel S. and Patrice M. Perkins, JT                 2,000                     3,762                  $31,600.00
                                                   -------                   -------               -------------

                  TOTALS                           100,000                   188,095               $1,580,000.00


</TABLE>


<PAGE>



                                    EXHIBIT A


             RIGHTS, PREFERENCES AND RESTRICTIONS OF PREFERRED STOCK


         The rights, preferences, restrictions and other matters relating to the
Series A Convertible Cumulative Preferred Stock (the "Series A Preferred Stock")
are as follows:

         1. Dividend Provisions.  Upon issuance,  dividends shall accrue on each
share of outstanding  Series A Preferred Stock at an annual rate equal to $1.264
per share per annum (8% of the Original Issue Price,  as defined  herein).  Such
dividends  shall be cumulative  and shall be payable upon any  conversion of the
Series A Preferred Stock pursuant to Section 3 hereof. Such dividends shall only
be paid out of legally  available funds of the Company.  Such dividends shall be
payable  by the  Company,  in its  sole  discretion,  all in  cash or all by the
issuance of a number of shares of the Company's  unrestricted,  freely  tradable
common  stock  equal to the  dividends  owing on the Series A  Preferred  Stock;
provided,  however,  that  prior  to the  payment  of any such  dividend  by the
issuance of shares of the Company's  common stock,  the Company shall deliver to
the  Investors an opinion of its counsel  stating that all such shares have been
validly  registered,  and that  they are duly  authorized,  validly  issued  and
nonassessable.  For the purposes  hereof,  the number of shares of the Company's
common stock issuable in lieu of any cash dividend payment shall equal the total
dividend  payment then due divided by the per share price of such stock. The per
share  price of the  Company's  common  stock shall be  determined  based on the
average  closing bid price of such stock  quoted on The Nasdaq  Stock Market for
the ten  consecutive  trading  days  prior  to the  payment  of such  dividends.
Dividends on shares of the Series A Preferred  Stock shall  accrue  beginning on
the date of issuance of the shares of Series A Preferred  Stock,  shall compound
on an  annual  basis  and  shall be  payable  upon  conversion  of the  Series A
Preferred  Stock (a "Payment  Date").  All accrued and unpaid  dividends  on the
Series A Preferred  Stock must be paid before any  dividends  may be declared or
paid on any other  junior  series of  preferred  or common  stock  issued by the
Company.

         2.       Liquidation Preference.

                  (a) In the event of any liquidation, dissolution or winding up
of the Company,  either voluntary or involuntary,  the holders of the previously
issued Convertible  Preferred Stock (the "Convertible  Preferred Stock") and the
Series A Preferred  Stock shall be entitled to receive,  prior and in preference
to any distribution of any of the assets of the Company to the holders of common
stock by reason of their ownership  thereof,  an amount per share equal to $2.50
for the Convertible  Preferred  Stock,  and for the Series A Preferred Stock the
sum of (i) $15.80,  as adjusted  pursuant to Section 4(c) hereof (the  "Original
Issue Price"),  and (ii) an amount equal to cumulative  unpaid dividends on such
shares (respectively, a "Liquidation Amount"). If upon the occurrence of such an
event,  the  assets  and  funds  thus  distributed  among  the  holders  of  the
Convertible   Preferred  Stock  and  the  Series  A  Preferred  Stock  shall  be
insufficient  to  permit  the  payment  to such  holders  of the full  aforesaid
preferential  amounts,  then, the entire assets and funds of the Company legally
available for distribution shall be distributed ratably among the holders of the
Convertible  Preferred  Stock and the Series A Preferred  Stock in proportion to
the amount of such stock owned by each such holder multiplied by the appropriate
Liquidation Amount.


<PAGE>

                  (b)  Upon  the  completion  of the  distribution  required  by
subparagraph  (a) of this  Section  2, if  assets  remain  in the  Company,  the
remaining  assets of the Company shall be distributed  ratably among the holders
of the Company's  common stock and the Series A Preferred Stock in proportion to
the number of shares of common stock held by each (assuming  full  conversion of
all shares of Series A Preferred Stock).

                  (c)  (i)  For  purposes  of  this  Section  2, a  liquidation,
dissolution or winding up of the Company shall be deemed to be occasioned by, or
to include, (A) the acquisition of the Company by another entity by means of any
transaction or series of related  transactions  (including  any  reorganization,
merger or  consolidation  but excluding any merger effected  exclusively for the
purpose  of  changing  the  domicile  of the  Company);  or (B) a sale of all or
substantially   all  of  the  assets  of  the  Company,   unless  the  Company's
shareholders as constituted  immediately prior to such acquisition or sale will,
immediately  after such  acquisition or sale (by virtue of securities  issued as
consideration for the Company's  acquisition or sale or otherwise) hold at least
50% of the voting power of the surviving or acquiring entity.

                        (ii)  In  any  of  such  events,  if  the  consideration
received  by the  Company is other than cash,  its value will be deemed its fair
market value.

                        (iii) In the event the  requirements  of this  Section 2
are not complied with, the Company shall forthwith either:

                                  (A) cause such closing to be  postponed  until
such time as the requirements of this Section 2 have been complied with, or

                                  (B) cancel  such  transaction,  in which event
the  rights,  preferences  and  privileges  of the  holders  of the  Convertible
Preferred Stock and the Series A Preferred Stock shall revert to and be the same
as such rights,  preferences and privileges  existing  immediately  prior to the
date of the first notice referred to in subsection 2(c)(iv) hereof.

                        (iv) The  Company  shall  give each  holder of record of
Convertible  Preferred  Stock and the Series A Preferred Stock written notice of
such  impending  transaction  not later than 20 days prior to the  shareholders'
meeting called to approve such  transaction,  or 20 days prior to the closing of
such  transaction,  whichever is earlier,  and shall also notify such holders in
writing of the final approval of such transaction;  provided,  however, that the
holder of any shares of then outstanding Convertible Preferred Stock or Series A
Preferred  Stock shall have the right during such 20-day  period to convert such
shares  pursuant to Section 3 hereof.  The first of such notices shall  describe
the  material  terms  and  conditions  of  the  impending  transaction  and  the
provisions of this Section 2, and the Company shall thereafter give such holders
prompt notice of any material  changes.  The transaction  shall in no event take

<PAGE>

place sooner than 20 days after the Company has given the first notice  provided
for herein or sooner  than ten days after the  Company  has given  notice of any
material changes provided for herein;  provided,  however, that such periods may
be  shortened  upon  the  written  consent  of the  holders  of the  Convertible
Preferred  Stock and the  Series A  Preferred  Stock that are  entitled  to such
notice rights or similar notice rights and that represent at least a majority of
the  voting  power of all then  outstanding  shares  of each of the  classes  of
preferred stock, voting separately as a class.

         3.       Conversion.

                  (a)  Conversion  Right.  At the option of the holder  thereof,
each share of Series A Preferred  Stock shall be  convertible at any time during
the period commencing on the day on which the Series A Preferred Stock is issued
and  expiring on May 15, 2000 (the date which is the second  anniversary  of the
date of issuance of the Series A Preferred Stock); provided,  however, that such
expiration  date shall be  extended  for a number of days equal to the number of
days  beyond  the  90th  day  following  the date of  issuance  of the  Series A
Preferred Stock that the Registration  Statement (as such term is defined in the
Registration  Rights  Agreement,  of even  date  herewith,  entered  into by and
between the Company  and the  Investors  set forth on Schedule A thereto) is not
effective (such date,  including any extension thereof pursuant to the foregoing
proviso,  being herein  referred to as the "Second  Anniversary").  The Series A
Preferred  Stock  shall be  convertible  at the  office  of the  Company  or any
transfer  agent for such stock into such number of fully paid and  nonassessable
shares of the  Company's  common stock as is determined by dividing the Original
Issue Price,  subject to adjustment as provided in Section 4, by the  Conversion
Price applicable to such shares,  determined as hereafter provided, in effect on
the  date  the  certificates   representing  such  shares  are  surrendered  for
conversion (the "Conversion  Date").  The Conversion Price shall be equal to the
average  closing bid price of one share of the Company's  common stock as quoted
by the Nasdaq  SmallCap  Market,  the Nasdaq  National  Market or the  principal
exchange upon which shares of the Company's  common stock may be listed,  or, if
the  Company's  common  stock  shall not then be quoted on the  Nasdaq  SmallCap
Market  or the  Nasdaq  National  Market  or  listed  on a  national  securities
exchange, but shall otherwise be traded in the over-the-counter  market, on such
over-the-counter  market for the ten-day  period  ending on the day prior to the
Conversion  Date  (the  "Trading  Period")  multiplied  by .8  (the  "Conversion
Price");  provided,  however, that in no event shall the Conversion Price exceed
$5.00 per share or be less than $2.75 (the "Maximum Price" and "Minimum  Price,"
respectively)  per share; and provided,  further,  that appropriate  adjustments
shall be made in determining the average closing bid price if a recapitalization
or other event  affecting  the  Company's  common  stock shall occur  during the
Trading Period.

                  (b) Dividend Payment. Should the Company,  pursuant to Section
1 hereof,  not elect to pay all  outstanding,  cumulative,  accrued  and  unpaid
dividends  on the Series A Preferred  Stock in shares of its common  stock,  the
Company shall pay, in immediately  available  funds, to the holder of any shares
of Series A Preferred Stock being converted, within two days, all such dividends
on the date that it  receives  notice of such  holder's  intent to convert  such
shares  pursuant to (d) below.  Separately,  should the Company elect to pay all
outstanding,  cumulative, accrued and unpaid dividends on the Series A Preferred
Stock in shares of its  common  stock,  it shall,  within two  business  days of
receiving  a  holder's  notice  of  intent  to  convert,   deliver  certificates
representing such shares to the holder of the Series A Preferred Stock.


<PAGE>

                  (c)  Automatic  Conversion.  Any shares of Series A  Preferred
Stock remaining  outstanding on the Second  Anniversary  shall be  automatically
converted pursuant to the conversion terms of Section 3(a) above. The Conversion
Date with respect to such automatic  conversion shall be the Second Anniversary.
In any event,  the  Company  shall,  within two  business  days after  automatic
conversion of the Series A Preferred  Stock,  issue and deliver a certificate or
certificates  for the number of shares of the  Company's  common  stock to which
each former holder of Series A Preferred Stock is entitled.  Notwithstanding the
foregoing,  no automatic  conversion of the Series A Preferred Stock shall occur
pursuant to this  Section  unless (i) all shares of the  Company's  common stock
underlying  the shares of Series A  Preferred  Stock may be sold  pursuant to an
effective  registration  statement under the Securities Act of 1933, as amended,
(ii) the  Company's  common  stock is listed and  trading  on The  Nasdaq  Stock
Market,  and (iii) the Company has reserved and  available for issuance a number
of shares of its common stock  sufficient to cover conversion of all outstanding
shares of Series A Preferred Stock.

                  (d)  Mechanics  of  Conversion.  Before any holder of Series A
Preferred  Stock  shall be  entitled  to  convert  the same  into  shares of the
Company's  common  stock,  he,  she or it shall  surrender  the  certificate  or
certificates  therefor,  duly  endorsed,  at the office of the Company or of any
transfer agent for the Series A Preferred  Stock, and shall give written notice,
via  facsimile,  to the  Company,  at its  principal  corporate  office,  of the
election to convert the same and shall state  therein the name or names in which
the certificate or certificates  for shares of the Company's common stock are to
be issued. The Company shall,  immediately  thereafter (and in any event no more
than two business days thereafter), issue and deliver to such holder of Series A
Preferred  Stock at the address shown on the Company's  records or at such other
address as such party may designate by written notice to the Company,  or to the
nominee or nominees of such holder, a certificate or certificates for the number
of shares of the  Company's  common stock to which such holder shall be entitled
pursuant  to  Section  3(a) and a  certificate  representing  shares of Series A
Preferred Stock not so converted by the holder.  Such conversion shall be deemed
to have been made  immediately  prior to the close of business on the Conversion
Date, and the person or persons  entitled to receive the shares of the Company's
common stock issuable upon such conversion  shall be treated for all purposes as
the record holder or holders of such shares of the Company's  common stock as of
such date.

                  (e) Mechanics of Automatic Conversion.  On the Conversion Date
with respect to the automatic  conversion pursuant to subsection 3(c) above, the
certificates  representing  shares of Series A Preferred Stock shall immediately
represent  that number of shares of the  Company's  common stock into which such
shares are convertible.  Holders of Series A Preferred Stock shall deliver their
certificates,  duly endorsed in blank,  to the principal  office of the Company,
together  with a  notice  setting  out the name or names  (with  addresses)  and
denominations in which the certificates representing such shares of common stock
issuable  upon  conversion  are to be  issued  and  including  instructions  for
delivery  thereof.  The person  entitled to receive the shares of the  Company's
common stock issuable upon such conversion  shall be treated for all purposes as
the record holder of such shares of common stock at and on the Conversion  Date,
and the rights of such person as a holder of shares of Series A Preferred  Stock

<PAGE>

shall cease and  terminate at and on the  Conversion  Date,  in any case without
regard to any failure by such holder to deliver the  certificates  or the notice
required  by this  subsection  3(e).  On the  Conversion  Date with  respect  to
automatic conversion, the Company shall pay all outstanding, cumulative, accrued
and unpaid dividends, either by the issuance of shares of its common stock or in
cash, pursuant to the provisions set forth in (a) above; provided, however, that
should the Company  elect to pay such  dividends by the  issuance of  additional
shares of its common  stock,  the person  entitled to receive such shares of the
Company's  common stock issuable upon such  conversion  shall be treated for all
purposes as the record holder of such additional shares on the Conversion Date

                  (f) No  Impairment.  The Company will not, by amendment of its
Articles  of  Incorporation  or through  any  reorganization,  recapitalization,
transfer  of  assets,  consolidation,  merger,  dissolution,  issue  or  sale of
securities or any other voluntary action,  avoid or seek to avoid the observance
or performance of any of the terms to be observed or performed  hereunder by the
Company,  but will at all times in good faith  assist in the carrying out of all
the  provisions of this Section 3 and in the taking of all such action as may be
necessary  or  appropriate  in order to  protect  the  conversion  rights of the
holders of the Series A Preferred Stock against impairment.

                  (g) No Fractional Shares. No fractional shares shall be issued
upon the conversion of any share or shares of the Series A Preferred  Stock, and
the number of shares of the Company's common stock to be issued shall be rounded
to the nearest whole share.  Whether or not fractional  shares are issuable upon
such  conversion  shall be determined on the basis of the total number of shares
of Series A Preferred  Stock the holder is at the time converting into shares of
the  Company's  common  stock and the  number of  shares  of such  common  stock
issuable upon such aggregate conversion.

                  (h) Notices of Record Date.  In the event of any taking by the
Company of a record of the holders of any class of securities for the purpose of
determining  the  holders  thereof who are  entitled to receive any  dividend or
other  distribution,  any right to subscribe for,  purchase or otherwise acquire
any  shares of stock of any class or any other  securities  or  property,  or to
receive  any other  right,  the  Company  shall mail to each  holder of Series A
Preferred Stock, at least 20 days prior to the date specified  therein, a notice
specifying  the date on which any such  record is to be taken for the purpose of
such  dividend,  distribution  or right,  and the amount and  character  of such
dividend, distribution or right.

                  (i) Reservation of Stock Issuable Upon Conversion. The Company
shall at all times reserve and keep available out of its authorized but unissued
shares of common stock,  solely for the purpose of effecting  the  conversion of
the shares of the Series A  Preferred  Stock,  such  number of its shares of its
common stock as shall from time to time be sufficient  to effect the  conversion
of all outstanding  shares of the Series A Preferred  Stock;  and if at any time
the number of authorized but unissued shares of the Company's common stock shall
not be sufficient to effect the conversion of all then outstanding shares of the
Series A  Preferred  Stock,  in  addition  to such  other  remedies  as shall be
available to the holder of such Series A Preferred  Stock, the Company will take
such  corporate  action as may, in the opinion of its  counsel,  be necessary to
increase its  authorized  but unissued  shares of common stock to such number of
shares as shall be  sufficient  for such  purposes,  including  engaging in best
efforts to obtain the requisite  shareholder approval of any necessary amendment
to the Company's Articles of Incorporation.


<PAGE>

                  (j) Notices.  Any notice  required by the  provisions  of this
Section 3 to be given to the holders of shares of Series A Preferred Stock shall
be deemed given if deposited in the United  States mail,  postage  prepaid,  and
addressed to each holder of record at his,  her or its address  appearing on the
books of the Company.

         4.       Anti-Dilution Provisions.

                  The Original  Issue Price shall be subject to adjustment  from
time to time upon the happening of any of the following events: (a) In the event
the  Company  shall  issue or sell any  shares of its  common  stock  (except as
provided in paragraph  (e) hereof) for a  consideration  per share less than the
greater of (A) $5.00,  or (B) 80% of the Market Price (as defined  below) on the
date of such issue or sale,  then the Original Issue Price shall be increased to
such greater  price  (calculated  to the nearest cent) as shall be determined by
multiplying the Original Issue Price by a fraction, the numerator of which shall
be the number of shares of the Company's  common stock  outstanding  immediately
after the issuance or sale of such  additional  shares,  and the  denominator of
which shall be the sum of (i) the number of shares of the Company's common stock
outstanding immediately prior to the issuance or sale of such additional shares,
and (ii) the number of shares of the Company's  common stock which the aggregate
consideration  received for the issuance or sale of such additional shares would
purchase at the  greater of $5.00,  or if such  shares of the  Company's  common
stock shall have been issued for a consideration  per share less than 80% of the
Market  Price on the date of issuance or sale,  the current  Market  Price.  For
purposes of this  paragraph,  all shares of the Company's  common stock issuable
upon  exercise  of  outstanding  options  and  warrants  shall be  deemed  to be
outstanding.

                  (b) For the purposes of paragraph  4(a) above,  the  following
subparagraphs (i) to (vii), inclusive, shall be applicable:

                        (i) If at any time the  Company  shall issue or sell any
rights to  subscribe  for, or any rights or options to  purchase,  shares of its
common stock or any stock or other  securities  convertible into or exchangeable
for such common stock (such  convertible  or  exchangeable  stock or  securities
being hereinafter called "Convertible  Securities"),  whether or not such rights
or options or the right to convert or exchange any such  Convertible  Securities
shall be  immediately  exercisable,  and the price per share for which shares of
the Company's common stock shall be issuable upon the exercise of such rights or
options  or  upon  conversion  or  exchange  of  such   Convertible   Securities
(determined by dividing (1) the total amount,  if any, received or receivable by
the Company as  consideration  for the granting of such rights or options,  plus
the minimum aggregate amount of additional  consideration payable to the Company
upon the  exercise  of such  rights or  options,  plus,  in the case of any such
rights or options  which shall  relate to  Convertible  Securities,  the minimum
aggregate amount of additional consideration,  if any, payable upon the issue or
sale of such Convertible Securities and upon the conversion or exchange thereof,
by (2) the total number of shares of the  Company's  common stock  issuable upon
the exercise of such rights or options or upon the conversion or exchange of all
such  Convertible  Securities  issuable  upon the  exercise  of such  rights  or
options)  shall be less than the  greater  of (x) the  $5.00,  or (y) 80% of the
Market Price at the time of such issue or sale,  then the total number of shares
of the  Company's  common  stock  issuable  upon the  exercise of such rights or

<PAGE>

options or upon  conversion or exchange of the total amount of such  Convertible
Securities issuable upon the exercise of such rights or options shall (as of the
date of granting of such rights or options) be deemed to be  outstanding  and to
have been issued for such price per share,  and except as provided in  paragraph
4(d), no further  adjustments of the Original Issue Price shall be made upon the
actual issue of such shares of common stock or of such  Convertible  Securities,
upon the  exercise  of such  rights or options or upon the actual  issue of such
common stock upon conversion or exchange of such Convertible Securities.

                        (ii) If at any time the Company  shall issue or sell any
Convertible  Securities,  whether  or not the  rights  to  exchange  or  convert
thereunder shall be immediately  exercisable,  and the price per share for which
shares of the Company's  common stock shall be issuable upon such  conversion or
exchange  (determined by dividing (1) the total amount received or receivable by
the  Company  as  consideration  for the  issue  or  sale  of  such  Convertible
Securities,  plus the minimum aggregate amount of additional  consideration,  if
any, payable to the Company upon the conversion or exchange thereof,  by (2) the
total  number  of  shares  of the  Company's  common  stock  issuable  upon  the
conversion or exchange of all such  Convertible  Securities)  shall be less than
the  greater  of (x) $5.00,  or (y) 80% of the Market  Price at the time of such
issue or sale,  then the total  number of shares of the  Company's  common stock
issuable upon conversion or exchange of all such  Convertible  Securities  shall
(as of the date of the issue or sale of such  Convertible  Securities) be deemed
to be outstanding and to have been issued for such price per share,  and, except
as provided in paragraph  4(d),  no further  adjustments  of the Original  Issue
Price shall be made upon the actual  issue of such  shares of common  stock upon
conversion or exchange of such Convertible Securities. In addition, if any issue
or sale of such Convertible Securities shall be made upon exercise of any rights
to subscribe  for or to purchase or any option to purchase any such  Convertible
Securities for which  adjustments of the Original Issue Price shall have been or
shall be made  pursuant  to other  provisions  of this  paragraph  4(b)(ii),  no
further  adjustment of the Original  Issue Price shall be made by reason of such
issue or sale.

                        (iii) If at any time the Company shall declare and pay a
dividend  or make any other  distribution  upon the shares of its  common  stock
payable in such stock or Convertible  Securities,  any such stock or Convertible
Securities,  as the  case  may be,  issuable  in  payment  of such  dividend  or
distribution shall be deemed to have been issued or sold without consideration.

                        (iv) If at any time any shares of the  Company's  common
stock or Convertible  Securities or any rights or options to purchase  shares of
any such stock or Convertible  Securities  shall be issued or sold for cash, the
consideration received therefor shall be deemed to be the amount received by the
Company therefor,  without  deduction  therefrom of any expenses incurred or any
underwriting  commissions  or  concessions  or discounts  paid or allowed by the
Company in  connection  therewith.  In case any shares of the  Company's  common
stock or  Convertible  Securities  or any rights or options to purchase any such
common  stock  or  Convertible   Securities  shall  be  issued  or  sold  for  a

<PAGE>

consideration  other than cash, the amount of the consideration  other than cash
received  by  the  Company  shall  be  deemed  to be  the  fair  value  of  such
consideration  as  determined  by the  Company's  Board  of  Directors,  without
deduction therefrom of any expenses incurred or any underwriting  commissions or
concessions or discounts paid or allowed by the Company in connection therewith.
In case any shares of the Company's  common stock or  Convertible  Securities or
any  rights  or  options  to  purchase  any such  common  stock  or  Convertible
Securities shall be issued in connection with any merger of another  corporation
into the Company, the amount of consideration therefor shall be deemed to be the
fair value of the net assets of such merged  corporation  as  determined  by the
Company's  Board of  Directors  after  deducting  therefrom  all cash and  other
consideration (if any) paid by the Company in connection with such merger.

                        (v) If at any time the  Company  shall  take a record of
the holders of its common stock for the purpose of entitling them (1) to receive
a dividend or other distribution payable in shares of the Company's common stock
or in Convertible Securities,  or (2) to subscribe for or purchase shares of the
Company's common stock or Convertible Securities, then such record date shall be
deemed to be the date of the issue or sale of the shares of the Company's common
stock deemed to have been issued or sold upon the  declaration  of such dividend
or the making of such other  distribution  or the date of the  granting  of such
right of subscription or purchase, as the case may be.

                        (vi) The number of shares of the Company's  common stock
outstanding  at any given time shall not include  shares owned or held by or for
the account of the Company,  provided that such shares are neither issued,  sold
or otherwise distributed by the Company.

                        (vii) For purposes hereof, the "Market Price" shall mean
the  average  closing  bid price of the  Company's  common  stock on the  Nasdaq
SmallCap Market, the Nasdaq National Market or the principal exchange upon which
shares of the Company's common stock may be listed,  or, if the Company's common
stock  shall not then be  quoted on the  Nasdaq  SmallCap  Market or the  Nasdaq
National Market or listed on a national securities exchange, but shall otherwise
be traded in the over-the-counter  market, on such  over-the-counter  market, in
each case for the ten day period immediately preceding any determination of such
"Market  Price"  (subject  to  appropriate  adjustments  which  shall be made in
determining the average closing bid price if a  recapitalization  or other event
affecting the Company's common stock shall occur during such 10-day period).  If
at any time  shares of the  Company's  common  stock  shall not be quoted on the
Nasdaq  SmallCap  Market or the  Nasdaq  National  Market,  listed on a national
securities  exchange,  or otherwise traded in the  over-the-counter  market, the
"Market  Price" of a share of the  Company's  common stock shall be deemed to be
the  higher  of (x)  the  book  value  thereof  (as  determined  by any  firm of
independent public accountants of nationally recognized standing selected by the
Company's  Board of  Directors) as of the last day of any month ending within 60
days  preceding  the date of  determination,  or (y) the fair value  thereof (as
determined in good faith by the Company's Board of Directors) as of a date which
shall be within 15 days of the date of determination.


<PAGE>

                   (c) In case at any  time  the  Company  shall  subdivide  its
outstanding shares of common stock into a greater number of shares, the Original
Issue Price in effect  immediately prior to such subdivision,  the Maximum Price
and the Minimum Price shall be  proportionately  reduced,  and the Company shall
subdivide the Series A Preferred  Stock in the same  proportion.  In case at any
time the outstanding shares of the Company's common stock shall be combined into
a smaller number of shares, the Original Issue Price in effect immediately prior
to  such  combination,  the  Maximum  Price  and  the  Minimum  Price  shall  be
proportionately  increased, and the Company shall combine the Series A Preferred
Stock in the same  proportion.  Any  adjustment  under this paragraph 4(c) shall
become  effective  at the  close of  business  on the date  the  subdivision  or
combination shall become effective.  The Company will take such corporate action
as may, in the opinion of its counsel,  be necessary to increase its  authorized
but  unissued  shares of Series A  Preferred  Stock to such  number of shares as
shall be sufficient for any such purposes, including engaging in best efforts to
obtain the  requisite  shareholder  approval of any  necessary  amendment to the
Company's Articles of Incorporation.

                  (d) If the  purchase or  exercise  price  provided  for in any
right or  option  referred  to in  paragraph  4(b)(i),  or the rate at which any
Convertible  Securities  referred  to in  paragraph  4(b)(i)  or (ii)  shall  be
convertible into or exchangeable for shares of the Company's common stock, shall
change or a different  purchase or exercise price or rate shall become effective
at any  time  or  from  time  to  time  (including  any  change  resulting  from
termination of such right,  option or  convertible  security),  then,  upon such
change  becoming  effective,  the Original Issue Price then in effect  hereunder
shall  forthwith be increased or decreased to such Original Issue Price as would
have been  obtained  had the  adjustments  made upon the granting or issuance of
such rights or options or Convertible Securities been made upon the basis of (A)
the issuance of the number of shares of the Company's  common stock  theretofore
actually  delivered  upon the  exercise  of such  options  or rights or upon the
conversion or exchange of such Convertible  Securities,  and (B) the granting or
issuance at the time of such change of any such options,  rights or  Convertible
Securities then still outstanding for the consideration, if any, received by the
Company therefor and to be received on the basis of such changed price.

                  (e) The Company  shall not be required to make any  adjustment
to the Original Issue Price in the case of:

                        (i) the granting,  after the date hereof, by the Company
of stock  options  under the  Company's  1997 Stock Option Plan,  so long as the
shares of the Company's  common stock underlying such options are covered by the
800,000  shares  currently  reserved for issuance under such plan as of the date
hereof,  assuming  approval by the Company's  shareholders  of the 300,000 share
increase at the Company's 1998 Annual Meeting of Shareholders;

                        (ii) the  issuance  of  shares of the  Company's  common
stock,  pursuant to the exercise of the options referred to in paragraph 4(e)(i)
above or the  exercise of any other  options or warrants  outstanding  as of the
date hereof; or


<PAGE>

                        (iii) the  issuance  of shares of the Series A Preferred
Stock  hereunder or of shares of the Company's  common stock upon the conversion
of any  shares  of the  Series A  Preferred  Stock or upon the  exercise  of the
Warrant or the Warrant issued to Miller,  Johnson & Kuehn,  Incorporated  on the
same date as the Preferred Stock Purchase Agreement to which this certificate of
Designation is an Exhibit.

         5. Voting Rights.  The holder of each share of Series A Preferred Stock
shall  have the right to the  number of votes on all  matters  submitted  to the
Company's  shareholders  that  shall be equal to the  number  of  shares  of the
Company's  common  stock into which such  holder's  shares of Series A Preferred
Stock shall then be convertible (assuming a conversion as of the record date set
for the vote).

         6.  Status of  Converted  Stock.  In the  event any  shares of Series A
Preferred Stock shall be converted  pursuant to Section 3 hereof,  the shares of
Series A  Preferred  Stock so  converted  shall be  canceled  and  shall  not be
issuable by the Company.  The Articles of  Incorporation of the Company shall be
appropriately  amended to effect the  corresponding  reduction in the  Company's
authorized capital stock.

         7.  Notice of  Adjustment.  The  Company  shall  provide all holders of
shares of Series A Preferred  Stock five business  days prior written  notice of
any  adjustments  in the Original Issue Price,  the Maximum  Price,  the Minimum
Price or any other adjustments made pursuant to the provisions hereof.



<PAGE>

                                    EXHIBIT B



         NEITHER  THIS  WARRANT NOR THE  SECURITIES  INTO WHICH THIS  WARRANT IS
EXERCISABLE HAVE BEEN REGISTERED WITH THE SECURITIES AND EXCHANGE  COMMISSION OR
THE SECURITIES  COMMISSION OF ANY STATE AND HAVE BEEN ISSUED IN RELIANCE UPON AN
EXEMPTION  FROM  REGISTRATION  UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
"SECURITIES ACT"), AND, ACCORDINGLY,  MAY NOT BE OFFERED OR SOLD EXCEPT PURSUANT
TO AN EFFECTIVE  REGISTRATION  STATEMENT UNDER THE SECURITIES ACT OR PURSUANT TO
AN AVAILABLE  EXEMPTION  FROM THE  REGISTRATION  REQUIREMENTS  THEREUNDER AND IN
COMPLIANCE WITH APPLICABLE STATE SECURITIES LAWS.



                                  DATAKEY, INC.

                                     WARRANT

Warrant No. [__]                                                   May 15, 1998


         DATAKEY,   INC.,  a  Minnesota  corporation  (the  "Company"),   hereby
certifies  that,  for value  received,  __________,  or its  registered  assigns
("Holder"), is entitled,  subject to the terms set forth below, to purchase from
the Company  _______  shares of common stock,  par value $.05 per share ("Common
Stock"), of the Company (each such share, a "Warrant Share" and all such shares,
the "Warrant Shares") at an exercise price equal to $6.30 per share (as adjusted
from time to time as provided in Section 8 hereof, the "Exercise Price"), at any
time and from  time to time  from and  after the date  hereof  and  through  and
including  May 14, 2003 (the  "Expiration  Date"),  and subject to the following
terms and conditions:

          1.  Registration of Warrant.  The Company shall register this Warrant,
upon records to be  maintained  by the Company for that  purpose  (the  "Warrant
Register"),  in the name of the  record  Holder  hereof  from time to time.  The
Company may deem and treat the registered Holder of this Warrant as the absolute
owner hereof for the purpose of any exercise  hereof or any  distribution to the
Holder,  and for all other  purposes,  and the Company  shall not be affected by
notice to the contrary.

          2.       Registration of Transfers and Exchanges.

                   (a) Subject to the provisions of (b) below, the Company shall
register the  transfer of any portion of this  Warrant in the Warrant  Register,
upon surrender of this Warrant, with the Form of Assignment attached hereto duly
completed and signed,  to the Company at the office  specified in or pursuant to
the terms  hereof.  Upon any such  registration  or  transfer,  a new warrant to

<PAGE>

purchase Common Stock, in  substantially  the form of this Warrant (any such new
warrant, a "New Warrant"), evidencing the portion of this Warrant so transferred
shall be issued to the  transferee  and a New Warrant  evidencing  the remaining
portion  of this  Warrant  not so  transferred,  if any,  shall be issued to the
transferring Holder. The acceptance of the New Warrant by the transferee thereof
shall be deemed  the  acceptance  by such  transferee  of all of the  rights and
obligations of a Holder of this Warrant.

                   (b) In the  event  the  Holder  of this  Warrant  desires  to
transfer this  Warrant,  or any Warrant  Shares issued upon the exercise  hereof
prior to the  registration  thereof  pursuant  to Section  4, the  Holder  shall
provide the Company with a written notice describing the manner of such transfer
and an  opinion of  counsel  (reasonably  acceptable  to the  Company)  that the
proposed transfer may be effected without  registration or qualification  (under
any federal or state law),  whereupon  such Holder shall be entitled to transfer
this Warrant or to dispose of any Warrant  Shares in accordance  with the notice
delivered by such Holder to the Company; provided,  however, that an appropriate
legend may be  endorsed on this  Warrant or the  certificates  for such  Warrant
Shares  respecting  restrictions upon transfer thereof necessary or advisable in
the opinion of counsel  satisfactory to the Company to prevent further transfers
which would be in violation of Section 5 of the Securities Act.

                   (c) This Warrant is  exchangeable,  upon the surrender hereof
by the Holder to the office of the Company specified in or pursuant to the terms
hereof for one or more New  Warrants,  evidencing  in the aggregate the right to
purchase the number of Warrant Shares which may then be purchased hereunder. Any
such New Warrants will be dated the date of such exchange.

          3.       Duration and Exercise of Warrants.

                   (a) This  Warrant  shall  be  exercisable  by the  registered
Holder on any business day before 5:00 P.M., Minneapolis, Minnesota time, at any
time and from time to time on or after  the date  hereof  to and  including  the
Expiration  Date. At 5:00 P.M.,  Minneapolis,  Minnesota  time on the Expiration
Date,  the portion of this  Warrant not  exercised  prior  thereto  shall be and
become  void and of no value.  Except as set forth in Section  13  hereof,  this
Warrant may not be redeemed by the Company.

                   (b)  Subject  to  provisions   elsewhere  contained  in  this
Warrant,  upon surrender of this Warrant,  with the Form of Election to Purchase
attached  hereto duly  completed  and signed,  to the Company at its address for
notice as set forth in Section 11 hereof, and upon payment of the Exercise Price
multiplied by the number of Warrant  Shares that the Holder  intends to purchase
hereunder,  in  lawful  money of the  United  States of  America,  in cash or by
certified  or official  bank check or checks,  all as specified by the Holder in
the Form of Election to Purchase,  the Company  shall  promptly (but in no event
later than two  business  days after the Date of Exercise  (as defined  herein))
issue or cause to be issued and cause to be  delivered to the Holder and in such
name or names as the Holder may designate,  a certificate for the Warrant Shares
issuable upon such  exercise.  Any person so designated by the Holder to receive
Warrant  Shares shall be deemed to have become  holder of record of such Warrant
Shares as of the Date of Exercise of this Warrant.



<PAGE>

                         A "Date  of  Exercise"  means  the  date on  which  the
Company  shall  have  received  (i)  this  Warrant  (or  any  New  Warrant,   as
applicable),  with the Form of Election to Purchase attached hereto (or attached
to such New Warrant)  appropriately  completed and duly signed, and (ii) payment
of the  Exercise  Price for the number of  Warrant  Shares so  indicated  by the
Holder hereof to be purchased.

                    (c) This Warrant shall be exercisable either in its entirety
or for a portion of the number of Warrant  Shares.  If this Warrant is exercised
for a number of  Warrant  Shares  which is less than all of the  Warrant  Shares
which may be purchased  under this Warrant,  the Company shall issue or cause to
be issued,  at its expense,  a New Warrant  evidencing the right to purchase the
remaining  number of Warrant  Shares for which no exercise has been evidenced by
this Warrant.

          4. Registration Provisions. The shares of Common Stock underlying this
Warrant shall be registered by the Company under the  Securities Act pursuant to
the terms of that  Registration  Rights  Agreement,  dated May 15, 1998,  by and
between the Company and Holder.

          5. Payment of Taxes.  The Company will pay all taxes  attributable  to
the transfer of this Warrant or the issuance of Warrant Shares upon the exercise
of this Warrant.

          6. Replacement of Warrant. If this Warrant is mutilated,  lost, stolen
or  destroyed,  the Company  shall  issue or cause to be issued in exchange  and
substitution for and upon  cancellation  hereof,  or in lieu of and substitution
for this Warrant,  a New Warrant,  but only upon receipt of evidence  reasonably
satisfactory to the Company of such loss, theft or destruction and indemnity, if
reasonably  satisfactory  to  it.  Applicants  for  a  New  Warrant  under  such
circumstances  shall also  comply  with such other  reasonable  regulations  and
procedures and pay such other  reasonable  charges as the Company may reasonably
prescribe.

          7. Reservation of Warrant Shares.  The Company  covenants that it will
at all times reserve and keep  available out of the aggregate of its  authorized
but unissued  shares of Common  Stock,  solely for the purpose of enabling it to
issue  Warrant  Shares upon  exercise of this  Warrant as herein  provided,  the
number of  Warrant  Shares  which are then  issuable  and  deliverable  upon the
exercise of this entire Warrant, free from preemptive rights or any other actual
contingent purchase rights of persons other than the Holder (taking into account
the adjustments and  restrictions of Section 8). The Company  covenants that all
Warrant Shares that shall be so issuable and  deliverable  shall,  upon issuance
and the payment of the applicable  Exercise  Price in accordance  with the terms
hereof,  be  duly  and  validly   authorized  and  issued  and  fully  paid  and
nonassessable.



<PAGE>

          8. Certain  Adjustments.  The Exercise Price and the number of Warrant
Shares  purchasable  upon the  exercise  of this  Warrant  shall be  subject  to
adjustment from time to time upon the happening of any of the following events:

                   (a) In the event the  Company  shall issue or sell any shares
of its  Common  Stock  (except  as  provided  in  paragraph  (f)  hereof)  for a
consideration  per share less than the greater of (A) the Exercise Price, or (B)
80% of the Market  Price (as  defined  below) on the date of such issue or sale,
then the  Exercise  Price  shall be  reduced to such  price  (calculated  to the
nearest  cent) as shall be  determined by  multiplying  the Exercise  Price by a
fraction, the numerator of which shall be the sum of (i) the number of shares of
Common  Stock  outstanding  immediately  prior to the  issuance  or sale of such
additional  shares,  and (ii) the  number of shares  of Common  Stock  which the
aggregate  consideration  received for the  issuance or sale of such  additional
shares would purchase at the greater of the Exercise Price, or if such shares of
Common Stock shall have been issued for a consideration  per share less than 80%
of the Market Price on the date of issuance or sale,  the current  Market Price,
and the  denominator  of which  shall be the  number of  shares of Common  Stock
outstanding  immediately  after the issuance or sale of such additional  shares.
For purposes of this  paragraph,  all shares of the Common Stock  issuable  upon
exercise of outstanding options and warrants shall be deemed to be outstanding.

                   (b) For the  purposes of Section  8(a) above,  the  following
subparagraphs (i) to (vii), inclusive, shall be applicable:

                         (i) If at any time the Company  shall issue or sell any
rights to subscribe for, or any rights or options to purchase,  shares of Common
Stock or any stock or other securities convertible into or exchangeable for such
Common  Stock  (such  convertible  or  exchangeable  stock or  securities  being
hereinafter  called  "Convertible  Securities"),  whether or not such  rights or
options or the right to  convert or  exchange  any such  Convertible  Securities
shall be  immediately  exercisable,  and the price per share for which shares of
Common  Stock shall be issuable  upon the  exercise of such rights or options or
upon  conversion  or  exchange of such  Convertible  Securities  (determined  by
dividing (1) the total amount,  if any, received or receivable by the Company as
consideration  for the  granting  of such  rights or  options,  plus the minimum
aggregate  amount of  additional  consideration  payable to the Company upon the
exercise  of such  rights or  options,  plus,  in the case of any such rights or
options  which shall relate to  Convertible  Securities,  the minimum  aggregate
amount of additional  consideration,  if any,  payable upon the issue or sale of
such Convertible  Securities and upon the conversion or exchange thereof, by (2)
the total  number of shares of Common Stock  issuable  upon the exercise of such
rights or options or upon the  conversion  or exchange  of all such  Convertible
Securities  issuable upon the exercise of such rights or options)  shall be less
than the greater of (x) the  Exercise  Price,  or (y) 80% of the Market Price at
the time of such issue or sale,  then the total number of shares of Common Stock
issuable  upon the  exercise  of such  rights or options or upon  conversion  or
exchange of the total amount of such  Convertible  Securities  issuable upon the
exercise  of such  rights or options  shall (as of the date of  granting of such
rights or options) be deemed to be outstanding  and to have been issued for such
price per share, and except as provided in Section 8(e), no further  adjustments
of the  Exercise  Price  shall be made upon the actual  issue of such  shares of
Common Stock or of such Convertible Securities, upon the exercise of such rights
or options or upon the actual  issue of such  Common  Stock upon  conversion  or
exchange of such Convertible Securities.

                         (ii) If at any time the Company shall issue or sell any
Convertible  Securities,  whether  or not the  rights  to  exchange  or  convert
thereunder shall be immediately  exercisable,  and the price per share for which
shares of Common  Stock  shall be  issuable  upon such  conversion  or  exchange


<PAGE>

(determined  by dividing  (1) the total  amount  received or  receivable  by the
Company as consideration  for the issue or sale of such Convertible  Securities,
plus the minimum aggregate amount of additional  consideration,  if any, payable
to the Company upon the conversion or exchange thereof,  by (2) the total number
of shares of Common Stock  issuable upon the  conversion or exchange of all such
Convertible  Securities)  shall be less  than the  greater  of (x) the  Exercise
Price,  or (y) 80% of the Market  Price at the time of such issue or sale,  then
the total number of shares of Common Stock issuable upon  conversion or exchange
of all such Convertible Securities shall (as of the date of the issue or sale of
such Convertible Securities) be deemed to be outstanding and to have been issued
for such price per share,  and,  except as provided in Section  8(e), no further
adjustments  of the  Exercise  Price shall be made upon the actual issue of such
shares  of Common  Stock or upon  conversion  or  exchange  of such  Convertible
Securities.  In addition,  if any issue or sale of such  Convertible  Securities
shall be made upon exercise of any rights to subscribe for or to purchase or any
option to purchase any such Convertible  Securities for which adjustments of the
Exercise Price shall have been or shall be made pursuant to other  provisions of
this Section 8(b)(ii), no further adjustment of the Exercise Price shall be made
by reason of such issue or sale.

                         (iii) If at any time the Company  shall declare and pay
a  dividend  or make any other  distribution  upon the  shares  of Common  Stock
payable in such stock or Convertible  Securities,  any such stock or Convertible
Securities,  as the  case  may be,  issuable  in  payment  of such  dividend  or
distribution shall be deemed to have been issued or sold without consideration.

                         (iv) If at any  time  any  shares  of  Common  Stock or
Convertible  Securities or any rights or options to purchase  shares of any such
stock  or  Convertible  Securities  shall  be  issued  or  sold  for  cash,  the
consideration received therefor shall be deemed to be the amount received by the
Company therefor,  without  deduction  therefrom of any expenses incurred or any
underwriting  commissions  or  concessions  or discounts  paid or allowed by the
Company  in  connection  therewith.  In case  any  shares  of  Common  Stock  or
Convertible  Securities  or any rights or options to  purchase  any such  Common
Stock or  Convertible  Securities  shall be issued  or sold for a  consideration
other than cash,  the amount of the  consideration  other than  received  by the
Company shall be deemed to be the fair value of such consideration as determined
by the Company's Board of Directors, without deduction therefrom of any expenses
incurred or any  underwriting  commissions  or  concessions or discounts paid or
allowed by the  Company in  connection  therewith.  In case any shares of Common
Stock or  Convertible  Securities  or any rights or options to purchase any such
Common Stock or Convertible  Securities  shall be issued in connection  with any
merger of another  corporation  into the  Company,  the amount of  consideration
therefor  shall be deemed to be the fair value of the net assets of such  merged
corporation as determined by the Company's  Board of Directors  after  deducting
therefrom  all cash and  other  consideration  (if any) paid by the  Company  in
connection with such merger.



<PAGE>

                         (v) If at any time the  Company  shall take a record of
the holders of Common Stock for the purpose of  entitling  them (1) to receive a
dividend  or  other  distribution  payable  in  shares  of  Common  Stock  or in
Convertible  Securities,  or (2) to subscribe  for or purchase  shares of Common
Stock or Convertible Securities, then such record date shall be deemed to be the
date of the  issue or sale of the  shares of  Common  Stock  deemed to have been
issued or sold upon the declaration of such dividend or the making of such other
distribution  or the  date of the  granting  of such  right of  subscription  or
purchase, as the case may be.

                         (vi) The number of shares of Common  Stock  outstanding
at any given time shall not include  shares  owned or held by or for the account
of the Company,  provided that such shares are neither issued, sold or otherwise
distributed by the Company.

                         (vii) For  purposes  hereof,  the "Market  Price" shall
mean the average  closing bid price of the Common  Stock on the Nasdaq  SmallCap
Market,  the Nasdaq National Market or the principal  exchange upon which shares
of Common Stock may be listed,  or, if the Common Stock shall not then be quoted
on the  Nasdaq  SmallCap  Market or the  Nasdaq  National  Market or listed on a
national   securities   exchange,   but  shall   otherwise   be  traded  in  the
over-the-counter  market, on such over-the-counter  market, in each case for the
ten day period  immediately  preceding the date of determination of such "Market
Price." If at any time shares of Common  Stock shall not be quoted on the Nasdaq
SmallCap Market or the Nasdaq National Market,  listed on a national  securities
exchange, or otherwise traded in the over-the-counter market, the "Market Price"
of a share of Common  Stock  shall be  deemed  to be the  higher of (x) the book
value  thereof (as  determined  by any firm of  independent  public  accounts of
nationally  recognized standing selected in good faith by the Company's Board of
Directors) as of the last day of any month ending  within 60 days  preceding the
date of  determination,  or (y) the fair value  thereof (as  determined  in good
faith by the Company's Board of Directors) as of a date which shall be within 15
days of the date of determination.

                   (c) In case at any  time  the  Company  shall  subdivide  its
outstanding shares of Common Stock into a greater number of shares, the Exercise
Price  shall be  proportionately  reduced.  In case at any time the  outstanding
shares of Common Stock shall be combined  into a smaller  number of shares,  the
Exercise Price shall be  proportionately  increased.  Any adjustment  under this
Section  8(c) shall  become  effective  at the close of business on the date the
subdivision or combination shall become effective.

                   (d) The  Company  shall  provide the Holder with at least ten
days prior written notice of any capital  reorganization or  reclassification of
the capital stock of the Company, or consolidation or merger of the Company with
another  corporation,  or the sale of all or substantially  all of the Company's
assets to another corporation.  Further, if any of the foregoing events shall be
effected in such a way that holders of Common Stock shall be entitled to receive
stock,  securities  or assets with respect to or in exchange  for Common  Stock,

<PAGE>

then, as a condition of such  reorganization,  reclassification,  consolidation,
merger or sale,  lawful and adequate  provision shall be made whereby the holder
hereof shall  thereafter have the right to purchase and receive,  upon the basis
and upon the terms and  conditions  specified in this Warrant and in lieu of the
shares of Common Stock of the Company  immediately  theretofore  purchasable and
receivable  upon the  exercise  of the rights  represented  hereby,  such stock,
securities  or assets as may be issued or payable with respect to or in exchange
for a number of  outstanding  shares of such Common Stock equal to the number of
shares of such stock immediately theretofore purchasable and receivable upon the
exercise   of  the   rights   represented   hereby   had  such   reorganization,
reclassification, consolidation, merger or sale not taken place, and in any such
case  appropriate  provisions  shall be made  with  respect  to the  rights  and
interests  of the Holder of this Warrant to the end that the  provisions  hereof
(including  provisions for adjustments of the Warrant  purchase price and of the
number of shares of Common Stock  purchasable upon the exercise of this Warrant)
shall  thereafter be applicable,  as nearly as may be, in relation to any shares
of stock,  securities or assets thereafter deliverable upon the exercise hereof.
The Company shall not effect any such consolidation, merger or sale unless prior
to the  consummation  thereof  the  successor  corporation  (if  other  than the
Company)  resulting  from  such  consolidation  or  merger,  or the  corporation
purchasing such assets,  shall assume by operation of law or written instrument,
the  obligation  to deliver to such holder such shares of stock,  securities  or
assets as, in  accordance  with the  foregoing  provisions,  such  holder may be
entitled to purchase.  Notice of such assumption shall be promptly mailed to the
registered  holder  hereof at the last  address of such holder  appearing on the
books of the Company.

                   (e) If the  purchase or exercise  price  provided  for in any
right or  option  referred  to in  Section  8(b)(i),  or the  rate at which  any
Convertible  Securities  referred  to  in  Section  8(b)(i)  or  (ii)  shall  be
convertible into or exchangeable  for shares of Common Stock,  shall change or a
different  purchase or exercise price or rate shall become effective at any time
or from time to time  (including any change  resulting from  termination of such
right,  option  or  convertible  security),  then,  upon  such  change  becoming
effective,  the Exercise Price shall forthwith be increased or decreased to such
Exercise  Price as would have been  obtained had the  adjustments  made upon the
granting or issuance of such rights or options or  Convertible  Securities  been
made upon the basis of (A) the  issuance of the number of shares of Common Stock
theretofore  actually  delivered  upon the exercise of such options or rights or
upon the  conversion  or exchange of such  Convertible  Securities,  and (B) the
granting or issuance at the time of such change of any such  options,  rights or
Convertible  Securities then still  outstanding for the  consideration,  if any,
received by the Company therefor and to be received on the basis of such changed
price.

                    (f) The Company shall not be required to make any adjustment
to the Exercise Price in the case of:

                         (i) the granting, after the date hereof, by the Company
of stock  options  under the  Company's  1997 Stock Option Plan,  so long as the
shares of Common Stock underlying such options are covered by the 800,000 shares
currently reserved for issuance under such plan as of the date hereof,  assuming
approval of the  Company's  shareholders  of the 300,000  share  increase at the
Company's 1998 Annual Meeting of Shareholders;



<PAGE>

                         (ii) the issuance of shares of Common  Stock,  pursuant
to the  exercise of the  options  referred  to in Section  8(e)(i)  above or the
exercise of any other options or warrants outstanding as of the date hereof; or

                         (iii) the  issuance  of shares of the  Preferred  Stock
pursuant to the Preferred  Stock Purchase  Agreement to which this Warrant is an
Exhibit or of shares of Common Stock upon the  conversion  of any shares of such
Preferred  Stock or upon the exercise of this Warrant or any warrants  issued to
Miller,  Johnson & Kuehn,  Incorporated  on the same date as the Preferred Stock
Purchase Agreement to which this Warrant is an Exhibit.

                   (g) Whenever the Exercise Price payable upon exercise of this
Warrant shall be adjusted pursuant to this Section, the number of Warrant Shares
purchasable  upon exercise of this Warrant shall be  simultaneously  adjusted by
multiplying  the number of Warrant  Shares  issuable  immediately  prior to such
adjustment by the Exercise Price in effect  immediately prior to such adjustment
and dividing the product so obtained by the Exercise Price, as adjusted.

          9. Payment of Exercise Price. The Holder may pay the Exercise Price in
cash or pursuant to a cashless exercise, as set forth below.

                    (a) Cash  Exercise.  The Holder  shall  deliver  immediately
available funds.

                    (b)  Cashless  Exercise.  The Holder  shall  surrender  this
Warrant to the Company  together  with a notice of cashless  exercise,  in which
event the  Company  shall  issue to the  Holder  the  number of  Warrant  Shares
determined as follows:

                            X = Y (A-B)/A

          where:

                            X = the number of Warrant Shares to be issued to the
Holder.

                            Y = the number of  Warrant  Shares  with  respect to
which this Warrant is being exercised.

                            A = the  average  of the  closing  bid prices of the
Common Stock for the five trading  days immediately prior to (but not including)
the Date of Exercise.

                            B = the Exercise Price.

For purposes of Rule 144  promulgated  under the Securities Act, it is intended,
understood  and  acknowledged  that the  Warrant  Shares  issued  in a  cashless
exercise  transaction  shall be deemed to have been acquired by the Holder,  and
the  holding  period  for the  Warrant  Shares  shall  be  deemed  to have  been
commenced, on the issue date.

          10. Fractional  Shares.  The Company shall not be required to issue or
cause to be issued  fractional  Warrant  Shares on the exercise of this Warrant.
The number of full Warrant  Shares which shall be issuable  upon the exercise of
this Warrant shall be computed on the basis of the  aggregate  number of Warrant
Shares purchasable on exercise of this Warrant so presented.  If any fraction of
a Warrant Share would, except for the provisions of this Section 10, be issuable
on the exercise of this Warrant,  the Company shall,  at its option,  (i) pay an
amount in cash equal to the Exercise Price multiplied by such fraction,  or (ii)
round the number of Warrant Shares issuable, up to the next whole number.


<PAGE>

          11. Notices. Any and all notices or other communications or deliveries
hereunder  shall be in writing and shall be deemed  given and  effective  on the
earliest of (i) the date of  transmission,  if such notice or  communication  is
delivered  via  facsimile at the facsimile  telephone  number  specified in this
Section,  (ii) the  business  day  following  the date of mailing,  if sent by a
nationally recognized overnight courier service, or (iii) upon actual receipt by
the party to whom such notice is required to be given.  The  addresses  for such
communications  shall be: (1) if to the Company,  to 407 West  Travelers  Trail,
Burnsville,  MN 55337, Attention:  President,  facsimile No.: (612) 890-2726, or
(ii)  if to the  Holder,  to the  Holder  at the  address  or  facsimile  number
appearing on the Warrant  Register or such other address or facsimile  number as
the Holder may provide to the Company in accordance with this Section 11.

          12.      Warrant Agent.

                   (a) The  Company  shall  serve as  warrant  agent  under this
Warrant.  Upon 30 days' notice to the Holder,  Company may appoint a new warrant
agent.

                   (b) Any corporation into which the Company or any new warrant
agent may be merged or any corporation resulting from any consolidation to which
the Company or any new  warrant  agent  shall be a party or any  corporation  to
which the Company or any new warrant agent  transfers  substantially  all of its
corporate trust or shareholders  services  business shall be a successor warrant
agent under this Warrant  without any further act.  Any such  successor  warrant
agent shall  promptly  cause  notice of its  succession  as warrant  agent to be
mailed (by first class mail, postage prepaid) to the Holder at the Holder's last
address as shown on the Warrant Register.

          13. Call of Warrant.  Subject to the conditions  set forth below,  the
Company  shall be  permitted  to call this  Warrant from the Holder in the event
that the closing bid price for shares of the Common Stock is at least $8-5/8 for
ten  consecutive  trading  days prior to the  Expiration  Date of this  Warrant.
Notwithstanding  the foregoing,  the Company may only exercise its right to call
this Warrant from the Holder if at the time of such call (i) all Warrant  Shares
may be sold pursuant to an effective registration statement under the Securities
Act, (ii) the Common Stock is listed and trading on The Nasdaq Stock Market, and
(iii) the Company has reserved and  available for issuance a number of shares of
its Common Stock  sufficient to cover the exercise of this Warrant in full.  The
Company  must provide the Holder with at least 20 days  advance  written  notice
(the "Warrant  Notice") of its intent to call this Warrant pursuant to the terms
hereof and the Holder  shall have 20  business  days from the date of receipt of
the Warrant Notice to exercise this Warrant (the "Sale  Period").  If the Holder
does not  exercise  this  Warrant  during  the Sale  Period,  the  Holder  shall
surrender  this  Warrant  to the  Company  at the  end of the  Sale  Period  for
cancellation by the Company,  and the Company shall transfer to the Holder,  via
wire transfer of immediately available funds, an amount equal to $.10 multiplied
by the number of shares of Common  Stock  subject to exercise  of this  Warrant.
Notwithstanding the foregoing,  the Sale Period shall be extended by that number
of days during such period for which the  registration,  listing and reservation
requirements  set forth in  clauses  (i)-(iii)  of this  Section 13 shall not be
satisfied.



<PAGE>

          14.      Miscellaneous.

                   (a) This Warrant shall be binding on and inure to the benefit
of the parties hereto and their  respective  successors  and permitted  assigns.
This  Warrant  may be amended  only in  writing  signed by the  Company  and the
Holder.

                   (b) Subject to Section 14(a), above,  nothing in this Warrant
shall be construed to give to any person or  corporation  other than the Company
and the Holder any legal or equitable right, remedy or cause under this Warrant;
this Warrant shall be for the sole and exclusive  benefit of the Company and the
Holder.

                   (c) This  Warrant  shall be  governed  by and  construed  and
enforced in  accordance  with the internal laws of the State of New York without
regard to the  principles  of conflicts of law thereof.  Each of the Company and
the Holder  irrevocably  consent  to the  exclusive  jurisdiction  of the United
States Federal courts and state courts, located in New York County, New York, in
any suit or proceeding relating to, based on or arising under this Agreement and
irrevocably  agree that all claims in respect of such suit or proceeding  may be
determined  in such  courts.  The Company  irrevocably  waives the defense of an
inconvenient  forum to the  maintenance of such suit or  proceeding.  Service of
process  on the  Company  mailed by first  class  mail  shall be deemed in every
respect  effective  service  of  process  upon the  Company  in any such suit or
proceeding. Nothing herein shall affect the right of the Holder to serve process
in any manner permitted by law.

                   (d) The  headings  herein are for  convenience  only,  do not
constitute a part of this Warrant and shall not be deemed to limit or affect any
of the provisions hereof.

In case any one or more of the  provisions  of this Warrant  shall be invalid or
unenforceable in any respect,  the validity and  enforceability of the remaining
terms  and  provisions  of this  Warrant  shall  not in any way be  affected  or
impaired  thereby  and the  parties  will  attempt in good faith to agree upon a
valid  and  enforceable  provision  which  shall  be a  commercially  reasonable
substitute  therefor,  and upon so agreeing,  shall  incorporate such substitute
provision in this Warrant.

         IN  WITNESS  WHEREOF,  Datakey,  Inc.  has  caused  this  Warrant to be
executed by its duly  authorized  officer and this Warrant to be dated as of May
15, 1998.

                                       DATAKEY, INC.


                                       By __________________________________
                               
                                       Its: ___________________________


<PAGE>


                          FORM OF ELECTION TO PURCHASE


(To be executed by the Holder to exercise the right to purchase shares of Common
Stock under the foregoing Warrant)


To DATAKEY, INC.


         In accordance  with the Warrant  enclosed with this Form of Election to
Purchase,  the  undersigned  hereby  irrevocably  elects to purchase  __________
shares of Common  Stock,  par value $.05 per share,  of  Datakey,  Inc.  and (i)
______ encloses herewith $_______ in cash or certified or official bank check or
checks,  which sum  represents  the aggregate  Exercise Price (as defined in the
Warrant) for the number of shares of Common Stock to which this Form of Election
to  Purchase  relates,  together  with  any  applicable  taxes  payable  by  the
undersigned pursuant to the Warrant, or (ii) _____ hereby elects to exercise the
enclosed Warrant pursuant to the cashless exercise  provisions set forth therein
(mark one).


         The  undersigned  requests that  certificates  for the shares of Common
Stock issuable upon this exercise be issued in the name of

                                    PLEASE   INSERT   SOCIAL   SECURITY  OR  TAX
                                    IDENTIFICATION NUMBER

                                    --------------------------------------------

- --------------------------------------------------------------------------------
                         (Please print name and address)


- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

         If the number of shares of Common  Stock  issuable  upon this  exercise
shall not be all of the shares of Common Stock which the undersigned is entitled
to purchase in accordance with the enclosed  Warrant,  the undersigned  requests
that a New Warrant (as defined in the Warrant)  evidencing the right to purchase
the shares of Common  Stock not  issuable  pursuant  to the  exercise  evidenced
hereby be issued in the name of and delivered to:


- --------------------------------------------------------------------------------
                         (Please print name and address)


- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------

Dated:  ______________________     Name of Holder:

                                   (Print)______________________________________

                                   (By:)________________________________________

                                   (Name:)______________________________________

                                   (Title:)_____________________________________

                              (Signature must conform in all respects to name of
                              holder as specified on the face of the Warrant)


<PAGE>


                               FORM OF ASSIGNMENT

           (To be completed and signed only upon transfer of Warrant)


         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ____________________________ the right represented by the within Warrant to
purchase  ______  shares of Common  Stock of  Datakey,  Inc. to which the within
Warrant relates and appoints ________________ attorney to transfer said right on
the books of Datakey, Inc. with full power of substitution in the premises.


Dated:


- -------------------


                                    -----------------------------------

                                    (Signature  must  conform in all respects to
                                    name of holder as  specified  on the face of
                                    the Warrant)

                                    -----------------------------------
                                    Address of Transferee


                                    -----------------------------------

                                    -----------------------------------

In the presence of:

- -----------------------------








<PAGE>


                                    EXHIBIT C

                           COMPANY BAD BOY CERTIFICATE


         1.  Neither the Company,  any of its  predecessors  nor any  affiliated
corporation:

                  (a) has filed a registration statement which is the subject of
any pending  proceeding or examination  under Section 8 of the Securities Act or
is the subject of any  refusal  order or stop order  thereunder  within the past
five years;

                  (b) is  subject  to any  pending  proceeding  under  Rule  258
promulgated  under the  Securities Act or any similar rule adopted under Section
3(b) of the Securities  Act, or to an order entered  thereunder  within the past
five years;

                  (c) has  been  convicted  within  the past  five  years of any
felony or misdemeanor in connection with the purchase or sale of any security or
involving the making of any false filing with the Commission;

                  (d) is subject to any order,  judgment, or decree of any court
of competent jurisdiction  temporarily or preliminary  restraining or enjoining,
or is  subject  to any  order,  judgment,  or decree  of any court of  competent
jurisdiction,  entered  within the past five years,  permanently  restraining or
enjoining, such person from engaging in or continuing any conduct or practice in
connection  with the purchase or sale of any security or involving the making of
any false filing with the Commission; or

                  (e)  is  subject  to a  United  States  Postal  Service  false
representation order entered under Section 3005 of Title 39, United States Code,
within the past five years,  or is subject to a temporary  restraining  order or
preliminary  injunction  entered  under  Section 3007 of Title 39, United States
Code, with respect to conduct alleged to have violated Section 3005 of Title 39,
United States Code.

         2. None of the Company's  directors,  officers,  general  partners,  or
beneficial owners of 10% or more of any class of its equity securities,  nor any
of its promoters presently connected with it in any capacity:

                  (a) has been convicted within the past ten years of any felony
or  misdemeanor  in  connection  with  the  purchase  or sale  of any  security,
involving  the making of a false filing with the  Commission,  or arising out of
the  conduct  of the  business  of an  underwriter,  broker,  dealer,  municipal
securities dealer, or investment advisor;

                  (b) is subject to any order,  judgment, or decree of any court
of competent jurisdiction temporarily or preliminarily enjoining or restraining,
or is  subject  to any  order,  judgment,  or decree  of any court of  competent
jurisdiction,  entered  within the past five  years,  permanently  enjoining  or
restraining  such person from engaging in or continuing  any conduct or practice
in connection  with the purchase or sale of any security or involving the making
of a false  filing  with the  Commission,  or arising  out of the conduct of the
business of an underwriter,  broker,  dealer,  municipal  securities  dealer, or
investment advisor;


<PAGE>

                  (c) is subject to an order of the Commission  entered pursuant
to Section  15(b),  Section  15(B)(a)  or 15(B)(c)  of the  Exchange  Act; or is
subject to an order of the Commission  entered pursuant to Section 203(e) or (f)
of the Investment Advisors Act of 1940;

                  (d) is suspended or expelled from  membership in, or suspended
or barred  from  association  with a member  of,  an  exchange  registered  as a
national  securities  exchange  pursuant  to Section 6 of the  Exchange  Act, an
association registered as a national securities association under Section 15A of
the Exchange Act, or a Canadian  securities  exchange or association for any act
or omission to act  constituting  conduct  inconsistent  with just and equitable
principles of trade; or

                  (e)  is  subject  to a  United  States  Postal  Service  false
representation order entered under Section 3005 of Title 39, United States Code,
within the past five years; or is subject to a restraining  order or preliminary
injunction entered under Section 3005 of Title 39, United States Code.

For the purposes  hereof,  Beneficial  Owner means a person  having the power to
vote or direct the vote or the power to dispose or direct the disposition of any
of the Company's securities.

         3. The  Company  has filed all reports  required  by the  Exchange  Act
during the past 12 calendar months.



                          REGISTRATION RIGHTS AGREEMENT


         This  Registration  Rights Agreement is made and entered into as of the
15th day of May, 1998, by and among Datakey,  Inc., a Minnesota corporation (the
"Company") and the Investors listed on Schedule A attached hereto (individually,
an "Investor" and collectively, the "Investors").

                                    RECITALS

         A. The  Investors  and the  Company  have  entered  into  that  certain
Preferred  Stock  Purchase   Agreement,   dated  May  15,  1998  (the  "Purchase
Agreement").

         B. It is a condition to the  transactions  contemplated in the Purchase
Agreement that the Company  provide the  registration  and other rights provided
herein and the parties hereto desire to provide for such rights on the terms and
conditions contained herein.

         NOW,  THEREFORE,   in  consideration  of  the  premises  and  covenants
contained herein, the parties hereto agree as follows:

         1. Defined Terms.  Unless otherwise  noted, all capitalized  terms used
herein shall have the meanings  afforded them in the Purchase  Agreement and the
Exhibits attached thereto.

         2. Required Registration. Within 30 days of the Closing date (the "File
Date"), the Company shall file a Registration Statement under the Securities Act
of 1933, as amended (the "Securities Act"), in accordance with the provisions of
either  Form  S-1 or Form  S-3,  as  required  by the  Securities  and  Exchange
Commission (the "Commission") covering the resale of the shares of the Company's
common stock (i) underlying the Preferred  Stock,  (ii)  underlying the Warrants
issued by the Company to  Investors  of even date  herewith  (collectively,  the
"Warrant"), and (iii) issuable by the Company in payment of the dividends on the
shares of the Preferred Stock (the "Dividends") and will use its best efforts to
have such Registration Statement become effective with the Commission as soon as
possible thereafter, and in any event, within 90 days of the date on which it is
filed.  The shares of the Company's  common stock underlying the Preferred Stock
and the Warrants and issuable in payment of the  Dividends is referred to herein
as the "Registrable Stock."

         3.   Registration  -  General   Provisions.   In  connection  with  the
registration  of the  Registrable  Stock under the  Securities  Act, the Company
will:

                  (a)  prepare  and file  with  the  Commission  a  registration
statement with respect to such  securities,  within 30 days of the Closing date,
and use its diligent, good faith efforts to cause such registration statement to
become  effective within 90 days of the date it is filed and keep the prospectus
which is a part of such Registration  Statement current until the earlier of the
date on which:  (i) all such shares have been sold, or (ii) five years after the
date it is declared effective by the Commission;


<PAGE>

                  (b) prepare and file with the  Commission  such  amendments to
such Registration  Statement and supplements to the prospectus contained therein
as may be necessary to keep such Registration Statement effective for the period
required by Section 3(a) above;

                  (c)   provide   the   Investors'   counsel   with   reasonable
opportunities  to review and  comment  on,  and  otherwise  participate  in, the
preparation of such Registration Statement;

                  (d)   furnish   to  the   Investors   participating   in  such
registration and to the underwriters of the securities being registered, if any,
such  reasonable  number of copies of the  Registration  Statement,  preliminary
prospectus,  final  prospectus  and such other  documents as the  Investors  and
underwriters  may reasonably  request in order to facilitate the public offering
of such securities;

                  (e) use its  diligent,  good  faith  efforts  to  register  or
qualify the securities  covered by such Registration  Statement under such state
securities  or  blue  sky  laws  of  such  jurisdictions  as the  Investors  may
reasonably  request,  except  that the  Company  shall  not for any  purpose  be
required  to execute a general  consent to service of process  (which  shall not
include a "Uniform  Consent to Service of Process" or other  similar  consent to
service of process which relates only to actions or  proceedings  arising out of
or in connection with the sale of securities,  or out of a violation of the laws
of the  jurisdiction  requesting such consent) or to qualify to do business as a
foreign corporation in any jurisdiction wherein it is not so qualified;

                  (f)  notify the  Investors,  promptly  after it shall  receive
notice  thereof,  of the  time  when  such  Registration  Statement  has  become
effective or a supplement to any prospectus  forming a part of such Registration
Statement has been filed with the Commission;

                  (g)  notify  the  Investors  promptly  of any  request  by the
Commission for the amending or supplementing of such  Registration  Statement or
prospectus or for additional information;

                  (h) prepare and file with the  Commission,  promptly  upon the
request of the Investors,  any  amendments or  supplements to such  Registration
Statement or prospectus  which, in the opinion of counsel for the Investors (and
concurred in by counsel for the Company),  is required  under the Securities Act
or the rules and  regulations  promulgated  thereunder  in  connection  with the
distribution of the shares of the Company's common stock by the Investors;

                  (i) prepare and promptly file with the Commission and promptly
notify the  Investors  of the filing of such  amendment  or  supplement  to such
Registration  Statement  or  prospectus  as  may be  necessary  to  correct  any
statements  or  omissions  if, at the time when a  prospectus  relating  to such
securities is required to be delivered under the Securities Act, any event shall
have occurred as the result of which any such prospectus or any other prospectus
as then in effect would  include an untrue  statement of a material fact or omit
to state any material  fact  necessary to make the  statements  therein,  in the
light of the circumstances in which they were made, not misleading;


<PAGE>

                  (j) advise the Investors,  and the Investors' counsel, if any,
promptly  after it shall  receive  notice or obtain  knowledge  thereof,  of the
issuance of any stop order by the  Commission  suspending the  effectiveness  of
such  Registration  Statement or the initiation or threatening of any proceeding
for that  purpose and  promptly  use its best efforts to prevent the issuance of
any stop order or to obtain its withdrawal if such stop order should be issued;

                  (k) not file any amendment or supplement to such  Registration
Statement or prospectus to which the Investors shall have reasonably objected on
the grounds that such  amendment or  supplement  does not comply in all material
respects  with  the  requirements  of  the  Securities  Act  or  the  rules  and
regulations  promulgated  thereunder,  after having been  furnished  with a copy
thereof at least five business days prior to the filing  thereof,  unless in the
opinion of counsel for the Company the filing of such amendment or supplement is
reasonably  necessary  to protect the  Company  from any  liabilities  under any
applicable federal or state law and such filing will not violate applicable law;
and

                  (l) at the request of the Investors,  furnish on the effective
date of the  Registration  Statement  and,  if  such  registration  includes  an
underwritten  public  offering,  at the closing provided for in the underwriting
agreement:   (i)  opinions,   dated  such  respective   dates,  of  the  counsel
representing the Company for the purposes of such registration, addressed to the
underwriters,  if any, and to the Investors  making such request,  covering such
matters as such  underwriters  or Investors  may  reasonably  request,  and (ii)
letters,  dated such respective  dates,  from the independent  certified  public
accountants of the Company,  addressed to the  underwriters,  if any, and to the
Investors,   covering  such  matters  as  such  underwriters  or  Investors  may
reasonably  request,  in which  letter such  accountants  shall  state  (without
limiting the generality of the foregoing)  that they are  independent  certified
public  accountants  within the  meaning of the  Securities  Act and that in the
opinion of such accountants the financial statements and other financial data of
the Company  included in the  Registration  Statement or the  prospectus  or any
amendment  or  supplement  thereto  comply  in all  material  respects  with the
applicable accounting requirements of the Securities Act.

         4.  Registration  Expenses.  The  Company  shall  pay all  Registration
Expenses (as defined  below) in  connection  with the inclusion of shares of the
Company's common stock in any Registration Statement, or application to register
or qualify  such  shares  under  state  securities  laws,  filed by the  Company
hereunder,  other than as set forth herein. For purposes of this Agreement,  the
term  "Registration  Expenses"  means the filing fees payable to the Commission,
any state  agency and the NASD;  the fees and  expenses of the  Company's  legal
counsel and  independent  certified  public  accountants in connection  with the
preparation  and filing of the  Registration  Statement  (and all amendments and
supplements  thereto)  with the  Commission;  and all  expenses  relating to the
printing of the  Registration  Statement,  prospectuses  and various  agreements
executed in connection  with the  Registration  Statement.  Notwithstanding  the
foregoing, the Investors will pay the fees and expenses of any legal counsel the
Investors  may  engage,  as well as the  Investors'  proportionate  share of any
custodian  fees  or  commission  or  discounts  which  may  be  payable  to  any
underwriter.


<PAGE>

         5.  Penalty  Payments.  In the event  that the  Registration  Statement
relating  to the  resale  of the  Registrable  Stock is not (i)  filed  with the
Commission by the Company on or before the File Date, or (ii) declared effective
by the Commission  within 150 days of the Closing date,  then, the Company shall
pay the Investors  the following  amounts  ("Penalty  Payments"):  (i) 1% of the
purchase  price  of the  Preferred  Stock  (the  "Purchase  Price")  paid by the
Investors to the Company if (A) the Registration Statement is not filed with the
Commission  by the File  Date,  and/or  (B) the  Registration  Statement  is not
declared  effective by the Commission  within 150 days of the Closing date, (ii)
an  additional  1% of the Purchase  Price if the  Registration  Statement is not
declared  effective by the  Commission  within 180 days of the Closing date, and
(iii) an additional 3% of the Purchase  Price for each 30-day period  thereafter
in which the Registration Statement is not declared effective by the Commission.
Penalties  for  failure  to  file  and/or  to  obtain   effectiveness  shall  be
cumulative.  The  Company  shall be liable  to the  Investor  for a full  30-day
period,  determined in accordance with the above schedule,  regardless of by how
many days it misses  one of the  targeted  filing or  effective  dates set forth
above. All such Penalty Payments shall be immediately  payable by the Company to
the  Investors  (on a pro rata basis based on the number of shares of  Preferred
Stock  purchased  by each under the  Purchase  Agreement)  via wire  transfer of
immediately  available  funds  by the  close  of  business  on last  day of each
respective period set forth above.

         6.  Indemnification.  With respect to the registration of the resale of
the shares of Registrable Stock:

                  (a) to the extent permitted by law, the Company will indemnify
and hold harmless each Investor, the trustees,  partners, officers and directors
of each Investor,  any  underwriter  (as defined in the Securities Act) for such
Investor and each person,  if any, who  controls  such  Investor or  underwriter
within the meaning of the Securities Act or the Securities Exchange Act of 1934,
as amended  (the  "Exchange  Act"),  against any  losses,  claims,  damages,  or
liabilities  (joint or  several)  to which  they may  become  subject  under the
Securities Act, the Exchange Act or other federal or state law,  insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon any of the  following  statements,  omissions or violations
(collectively a "Violation") by the Company: (i) any untrue statement or alleged
untrue  statement of a material fact  contained in the  Registration  Statement,
including any preliminary  prospectus or final prospectus  contained  therein or
any amendments or supplements thereto,  (ii) the omission or alleged omission to
state  therein a material fact  required to be stated  therein,  or necessary to
make the statements  therein not  misleading,  or (iii) any violation or alleged
violation by the Company of the  Securities  Act,  the  Exchange  Act, any state
securities law or any rule or regulation  promulgated  under the Securities Act,
the Exchange Act or any state  securities  law in  connection  with the offering
covered by the Registration Statement;  and the Company will reimburse each such
Investor, trustee, partner, officer, director, underwriter or controlling person
for any legal or other expenses  reasonably  incurred by them in connection with
investigating or defending any such loss,  claim,  damage,  liability or action;
provided,  however,  that the  indemnity  agreement  contained in this Section 6
shall not apply to amounts paid in settlement of any such loss,  claim,  damage,
liability or action if such  settlement  is effected  without the consent of the
Company  (which  consent  shall  not be  unreasonably  withheld),  nor shall the
Company be liable in any such case for any such loss, claim,  damage,  liability
or action to the extent that it arises out of or is based upon a Violation which
occurs in reliance upon and in conformity with written information  furnished to
it  expressly  for use in  connection  with such  registration  by an  Investor,
trustee,  partner,  officer,  director,  underwriter or controlling person of an
Investor.


<PAGE>

                  (b) to  the  extent  permitted  by  law,  each  Investor  will
indemnify  and hold  harmless the Company,  each of its  directors,  each of its
officers,  each person,  if any, who controls the Company  within the meaning of
the Securities Act, any underwriter  and any other Investor  selling  securities
under the  Registration  Statement  or any of such other  Investor's,  trustees,
partners,  directors  or  officers  or any person who  controls  such  Investor,
against any losses,  claims,  damages or liabilities (joint or several) to which
the Company or any such director,  officer,  controlling person,  underwriter or
other such  Investor,  or trustee,  partner,  director,  officer or  controlling
person of such other Investor may become  subject under the Securities  Act, the
Exchange  Act or other  federal or state law,  insofar as such  losses,  claims,
damages or liabilities (or actions in respect thereto) arise out of or are based
upon any  Violation,  in each case to the extent (and only to the  extent)  that
such  Violation   occurs  in  reliance  upon  and  in  conformity  with  written
information  furnished by such Investor and stated to be specifically for use in
connection  with such  registration;  and each such Investor will  reimburse any
legal or other expenses reasonably incurred by the Company or any such director,
officer, controlling person, underwriter or other Investor, or trustee, partner,
officer,  director or  controlling  person of such other  Investor in connection
with  investigating  or defending  any such loss,  claim,  damage,  liability or
action if it is judicially determined that there was such a Violation; provided,
however,  that the  indemnity  agreement  contained  in this Section 6 shall not
apply to amounts paid in settlement of any such loss, claim,  damage,  liability
or action if such  settlement  is effected  without the consent of the Investor,
which consent shall not be unreasonably  withheld;  provided further, that in no
event shall any  indemnity  under this Section 6 exceed the gross  proceeds from
the offering  received by such  Investor  unless the  Violation is the result of
fraud on the part of such Investor.

                  (c) promptly after receipt by an indemnified  party under this
Section of notice of the commencement of any action  (including any governmental
action),  such  indemnified  party shall, if a claim in respect thereof is to be
made  against  any  indemnifying  party  under  this  Section,  deliver  to  the
indemnifying  party  a  written  notice  of the  commencement  thereof  and  the
indemnifying  party shall have the right to  participate  in, and, to the extent
the indemnifying  party so desires,  jointly with any other  indemnifying  party
similarly  noticed,   to  assume  the  defense  thereof  with  counsel  mutually
satisfactory to the parties; provided,  however, that an indemnified party shall
have the right to retain its own counsel,  with the fees and expenses to be paid
by the indemnifying party; and provided further,  that if there is more than one
indemnified party, the indemnifying party shall pay for the fees and expenses of
one counsel for any and all  indemnified  parties to be mutually  agreed upon by
such indemnified parties,  unless  representation of an indemnified party by the
counsel retained by the other indemnified  parties would be inappropriate due to
actual or potential  differing interests between such indemnified  parties.  The
failure to deliver written notice to the indemnifying  party within a reasonable
time of the  commencement of any such action,  if materially  prejudicial to its
ability to defend such  action,  shall  relieve such  indemnifying  party of any
liability to the  indemnified  party under this Section,  but the omission so to
deliver  written  notice to the  indemnifying  party will not  relieve it of any
liability that it may have to any  indemnified  party  otherwise than under this
Section.


<PAGE>

                  (d) if the  indemnification  provided  for in this  Section is
held by a court of competent  jurisdiction  to be  unavailable to an indemnified
party with respect to any losses,  claims,  damages or  liabilities  referred to
herein,  the indemnifying  party, in lieu of indemnifying such indemnified party
thereunder,  shall to the extent permitted by applicable law,  contribute to the
amount  paid or  payable  by such  indemnified  party as a result of such  loss,
claim,  damage or liability in such  proportion as is appropriate to reflect the
relative fault of the indemnifying  party on the one hand and of the indemnified
party on the other in  connection  with the  Violation(s)  that resulted in such
loss,  claim,  damage  or  liability,  as well as any other  relevant  equitable
considerations.  The  relative  fault  of  the  indemnifying  party  and  of the
indemnified  party shall be  determined by a court of law by reference to, among
other things,  whether the untrue or alleged untrue statement of a material fact
or the  omission  or  alleged  omission  to state a  material  fact  relates  to
information  supplied by the indemnifying  party or by the indemnified party and
the parties' relative intent,  knowledge,  access to information and opportunity
to correct or prevent such statement or omission.  No person or entity guilty of
fraudulent misrepresentation (within the meaning of Section 11 of the Securities
Act) shall be entitled to  contribution  from any person or entity who shall not
have been guilty of such fraudulent misrepresentation.

                  (e) the obligation of the Company and the Investors under this
Section shall survive the completion of any offering for resale of shares of the
Registrable Stock in the Registration Statement, and otherwise.

         7.  Limitation on Subsequent  Registration  Rights.  From and after the
date of this Agreement, the Company shall not, without the prior written consent
of all of the  Investors,  enter into any  agreement  with any person or persons
providing for the granting to such holder of  registration  rights pari passu or
senior  to  those  granted  to  Investors  pursuant  to  this  Agreement,  or of
registration  rights  which  might  cause a  reduction  in the  number of shares
includable by the Investors in any registration.

         8.       Miscellaneous.

                  (a) The Company shall not  hereafter  enter into any agreement
with respect to its securities that is  inconsistent  with the rights granted to
the Investors in this Agreement.

                  (b) Except as otherwise  provided  herein,  the  provisions of
this  Agreement  may not be amended,  modified or  supplemented,  and waivers or
consents to or departures  from the  provisions  hereof may not be given or made
unless the Company has obtained the written consent of the Investors.


<PAGE>

                  (c) All  notices  and  other  communications  provided  for or
permitted hereunder shall be made by hand delivery, telex, facsimile,  overnight
courier or registered first-class mail:

                         (i) if to an  Investor,  at the  address  set  forth on
                    Schedule A attached hereto;

                         (ii) if to the Company, at the address set forth in the
                    Purchase Agreement.

All such  notices  and  communications  shall be deemed to have been duly given:
when  delivered,  if by hand,  overnight  courier or mail;  when the appropriate
answer back is  received,  if by telex;  when  transmission  is confirmed by the
sending unit, if by facsimile.

                  (d)  This   Agreement   may  be  executed  in  any  number  of
counterparts and by the parties hereto in separate  counterparts,  each of which
when so  executed  shall be  deemed  to be an  original  and all of which  taken
together shall constitute one and the same agreement.

                  (e) The  headings to this  Agreement  are for  convenience  of
reference only and shall not limit or otherwise affect the meaning hereof.

                  (f) This  Agreement  shall be  governed  by and  construed  in
accordance  with the laws of the State of New York without  giving effect to the
principles  of choice or  conflict of law  thereof.  Each of the Company and the
Investors irrevocably consent to the exclusive jurisdiction of the United States
Federal  courts and state courts,  located in New York County,  New York, in any
suit or  proceeding  relating to, based on or arising  under this  Agreement and
irrevocably  agree that all claims in respect of such suit or proceeding  may be
determined  in such  courts.  The Company  irrevocably  waives the defense of an
inconvenient  forum to the  maintenance of such suit or  proceeding.  Service of
process  on the  Company  mailed by first  class  mail  shall be deemed in every
respect  effective  service  of  process  upon the  Company  in any such suit or
proceeding.  Nothing  herein  shall  affect the right of any  Investor  to serve
process in any manner permitted by law.

                  (g) In the  event  that  any  one or  more  of the  provisions
contained  herein,  or the  application  thereof in any  circumstances,  is held
invalid,  illegal or unenforceable in any respect for any reason,  the validity,
legality and  enforceability of such provision in every other respect and of the
remaining  provisions contained herein shall not be in any way impaired thereby,
it being intended that all of the rights and privileges of the Investors and the
Company shall be enforceable to the fullest extent permitted by law.

                  (h) The  remedies  provided  for in this  Agreement  shall  be
cumulative and in addition to all other remedies available, at law or in equity,
and nothing herein shall limit a holder's right to pursue actual damages for any
failure by the Company to comply with the terms of this Agreement.


<PAGE>


         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed  by their  duly  authorized  representatives  as of the date  indicated
above.


Datakey, Inc.                      Special Situations Private Equity Fund, L.P.:


By:  /s/ Alan Shuler                        By: /s/ David Greenhouse
Its: Chief Financial Officer                Its:
                                            Tax Identification Number: 

Special Situations Technology Fund, L.P.:   Robert G. Allison

By: /s/ David Greenhouse                    By: /s/ Richard C. Perkins
Its:                                        Attorney-in-Fact
Tax Identification Number:                Tax Identification Number: 


Shirley A. Baxter, TTEE
FBO Shirley A. Baxter Revocable             Craig L. Campbell
Trust U/A DTD 7-3-96

By: /s/ Richard C. Perkins                  By: /s/ Richard C. Perkins
Attorney-in-Fact                            Attorney-in Fact
Tax Identification Number:                  Tax Identification Number: 


Piper Jaffray as Custodian FBO Bradley      Piper Jaffray as Custodian
A. Erickson IRA 480-263177-102              FBO Richard C. Perkins

By: /s/ Richard C. Perkins                  By: /s/ Richard C. Perkins
Attorney-in-Fact                            Attorney-in Fact
Tax Identification Number: 41-1422918     Tax Identification Number:  41-1422918

David M. Westrum, TTEE
FBO David M. Westrum
Revocable Living Trust                      Pyramid Partners, L.P.
U/A DTD 6-1-97

By: /s/ Richard C. Perkins                  By: /s/ Richard C. Perkins
Attorney-in-Fact                            Attorney-in Fact
Tax Identification Number:                  Tax Identification Number: 


Industricorp & Co., Inc.                    Daniel S. & Patricia M. Perkins JT
FBO Twin City Carpenters Pension Plan

 /s/ Karen McKernan                         /s/ Daniel S. Perkins
By:  Union Bank & Trust,                    Daniel S. Perkins
Its  Officer                                /s/ Patrice M. Perkins
                                            Patrice M. Perkins
                                          Tax Identification Number: 
Gary Kohler IRA

/s/ Gary S. Kohler
By:  Gary Kohler

<PAGE>



                                  Schedule A-1
                                   SCHEDULE A

                                    INVESTORS

Special Situations Private Equity Fund, L.P.
153 East 53rd Street
51st Floor
New York, New York 10022

Special Situations Technology Fund, L.P.
153 East 53rd Street
51st Floor
New York, New York 10022

Gary Kohler IRA

Robert G. Allison

Shirley A. Baxter, TTEE
FBO Shirley A. Baxter Revocable Trust
U/A DTD 7-3-96

Craig L. Campbell

Piper Jaffray as Custodian
FBO Bradley A. Erickson
IRA 480-263177-102

Piper Jaffray as Custodian FBO
Richard C. Perkins
IRA 980-576-905-610

David M. Westrum TTEE
FBO David M. Westrum
Revocable Living Trust
U/A DTD 6-1-97

Pyramid Partners L.P.

Industricorp & Co., Inc.
FBO Twin City Carpenters Pension Plan

Daniel S. and Patrice M. Perkins, JT



                       CONSENT OF INDEPENDENT ACCOUNTANTS


We  hereby  consent  to the  incorporation  by  reference  in this  Registration
Statement on Form S-3 of our report,  dated  February 3, 1998,  which appears in
the Annual Report on Form 10-KSB of Datakey,  Inc. and  Subsidiary  for the year
ended  December 31, 1997. We also consent to the reference to our Firm under the
caption "Experts" in the aforementioned Registration Statement.

                                                     /s/ McGladrey & Pullen, LLP
                                                         McGLADREY & PULLEN, LLP

Minneapolis, Minnesota
June 10, 1998



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