EXHIBIT 2.2


            CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors
VASCO Data Security International, Inc.:

    We consent to the incorporation by reference in the registration statements
(No. 333-62829 on Form S-8 and No. 333-46256 on Form S-3) of our report dated
January 31, 2005 relating to the Balance Sheets of AOS-Hagenuk B.V. as of
December 31, 2004, 2003 and 2002 and the related Statements of Operations, Cash
Flows and Stockholders' Equity for each of the years in the three-year period
ended December 31, 2004, which report appears in the April 20, 2005 current
report on Form 8-K/A of VASCO Data Security International, Inc.


/s/ BERK Accountants en Belastingadviseurs

BERK Accountants en Belastingadviseurs
's-Hertogenbosch
The Netherlands
April 20, 2005