UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
SCHEDULE 13G
INFORMATION STATEMENT PURSUANT TO RULES 13D-1 AND 13D-2
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO. 3)1/
SECURITY DYNAMICS TECHNOLOGIES, INC.
(Name of Issuer)
Common Stock, $0.01 par value per share
(Title or Class of Securities)
814208104
(CUSIP Number)
1/The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
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CUSIP No. 814208104 13G Page 2 of 5 Pages
_______________________________________________________________________________
1 NAMES OF REPORTING PERSONS
S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
Kenneth P. Weiss ###-##-####
_______________________________________________________________________________
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(SEE INSTRUCTIONS)
(A) [ ]
N/A (B) [ ]
_______________________________________________________________________________
3 SEC USE ONLY
_______________________________________________________________________________
4 CITIZENSHIP OR PLACE OF ORGANIZATION
United States of America
_______________________________________________________________________________
5 SOLE VOTING POWER
NUMBER OF 2,354,516
SHARES 6 SHARED VOTING POWER
BENEFICIALLY
OWNED BY 0
EACH 7 SOLE DISPOSITIVE POWER
REPORTING
PERSON 2,354,516
WITH 8 SHARED DISPOSITIVE POWER
0
_______________________________________________________________________________
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
2,354,516
_______________________________________________________________________________
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(SEE INSTRUCTIONS) [ ]
N/A
_______________________________________________________________________________
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
5.9%
_______________________________________________________________________________
12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IN
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CUSIP No. 814208104 13G Page 3 of 5 Pages
ITEM 1(A). NAME OF ISSUER:
Security Dynanmics Technologies, Inc.
ITEM 1(B). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
20 Crosby Drive
Bedford, MA 01730
ITEM 2(A). NAME OF PERSON FILING:
Kenneth P. Weiss
ITEM 2(B). RESIDENCE:
59 Sargent Street
Newton, MA 02158
ITEM 2(C). CITIZENSHIP:
United States of America
ITEM 2(D). TITLE OF CLASS OF SECURITIES:
Common Stock, $0.01 par value per share, (the "shares")
ITEM 2(E). CUSIP NUMBER:
814208104
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CUSIP No. 814208104 13G Page 4 of 5 Pages
ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 13D-2(B),
CHECK WHETHER THE PERSON FILING IS A:
Not applicable.
ITEM 4. OWNERSHIP:
(a) Amount beneficially owned: 2,354,516 shares
(b) Percent of class: 5.9%
(c) Number of shares as to which such person has:
(i) Sole Power to vote or to direct the vote: 2,354,516 shares
(ii) Shared power to vote or to direct the vote: 0 shares
(iii) Sole power to dispose or to direct the disposition of:
2,354,516 shares
(iv) Shared power to dispose or to direct the disposition of:
0 shares
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:
Not applicable.
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:
Not applicable.
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:
Not applicable.
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:
Not applicable.
<PAGE>
CUSIP No. 814208104 13G Page 5 of 5 Pages
ITEM 9. NOTICE OF DISSOLUTION OF GROUP:
Not applicable.
ITEM 10. CERTIFICATION:
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were acquired in the
ordinary course of business and were not acquired for the purpose of
and do not have the effect of changing or influencing the control of
the issuer of such securities and were not acquired in connection
with or as a participant in any transaction having such purposes or
effect.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
January 27, 1998
(Date)
By: /s/ Kenneth P. Weiss
________________________
Kenneth P. Weiss
