Exhibit 23.1
CONSENT OF KPMG LLP
We consent to the incorporation by reference in this registration statement on
Form S-3 of our report dated February 24, 2000, relating to the consolidated
balance sheets of VASCO Data Security International, Inc. and subsidiaries as of
December 31, 1998 and 1999 and the related consolidated statements of
operations, comprehensive income, stockholders' deficit, and cash flows for each
of the years in the three-year period ended December 31, 1999, and the related
schedule, which report appears in the December 31, 1999 annual report on Form
10-K of VASCO Data Security International, Inc. and to the reference to our firm
under the heading "Experts" in the prospectus.
/s/ KPMG LLP
Chicago, Illinois
September 20, 2000
