EXHIBIT 31.2

                  Certification of Principal Financial Officer
            Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002


I, Clifford K. Bown, the principal financial officer of VASCO Data Security
International, Inc., certify that:

1.   I have reviewed this annual report on Form 10-K of VASCO Data Security
     International, Inc.;

2.   Based on my knowledge, this report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary
     in order to make the statements made, in light of the circumstances
     under which such statements were made, not misleading with respect to
     the period covered by this report;

3.   Based on my knowledge, the financial statements, and other financial
     information included in this report, fairly present in all material
     respects the financial condition, results of operations and cash flows
     of the registrant as of, and for, the periods presented in this report;

4.   The registrant's other certifying officers and I are responsible for
     establishing and maintaining disclosure controls and procedures (as
     defined in Exchange Act Rules 13a-145(e) and 15d-145(e)) for the
     registrant and have:

     (a)  Designed such disclosure controls and procedures, or caused such
          disclosure controls and procedures to be designed under our
          supervision, to ensure that material information relating to the
          registrant, including its consolidated subsidiaries, is made known to
          us by others within those entities, particularly during the period in
          which this report is being prepared;

     (b)  Evaluated the effectiveness of the registrant's disclosure controls
          and procedures and presented in this report our conclusions about the
          effectiveness of the disclosure controls and procedures as of the end
          of the period covered by the report based on such evaluation; and;

     (c)  Disclosed in this report any change in the registrant's internal
          control over financial reporting that occurred during the registrant's
          most recent fiscal quarter (the registrant's fourth fiscal quarter in
          the case of an annual report) that has materially affected, or is
          reasonably likely to materially affect, the registrant's internal
          control over financial reporting; and

5.   The registrant's other certifying officers and I have disclosed, based
     on our most recent evaluation of internal control over financial
     reporting, to the registrant's auditors and the audit committee of
     registrant's board of directors (or persons fulfilling the equivalent
     functions):

     (a)  All significant deficiencies and material weaknesses in the design or
          operation of internal control over financial reporting which are
          reasonably likely to adversely affect the registrant's ability to
          record, process, summarize and report financial information; and

     (b)  Any fraud, whether or not material, that involves management or other
          employees who have a significant role in the registrant's internal
          control over financial reporting.


Dated:  March 29, 2005               /s/ Clifford K. Bown
                                     ------------------------------------------
                                     Clifford K. Bown
                                     Chief Financial Officer
                                     (Principal Financial Officer and Principal
                                     Accounting Officer)