June 30, 2008

OAKBROOK TERRACE, Ill., and ZURICH, Switzerland, June 30, 2008 - VASCO Data Security International, Inc. (Nasdaq: VDSI) (www.vasco.com ), a leading software security company specializing in authentication products, today announced that it ranks 5th in FORTUNE Small Business’ Top 100 list of America's fastest-growing small public companies.

For the compilation of the eighth annual list, FORTUNE Small Business worked with financial research firm Zacks, which ranked public companies with revenues of less than $200 million and a stock price of more than $1. All companies that met these criteria were ranked, 1-100, based on the past three years' earnings growth, revenue growth, and stock performance. The overall rank was based on the sum of these three ranks. Banks and real-estate firms were excluded from the list.

VASCO ranks 5th- as to eleventh in 2007 - and is the first technology and IT-company in FORTUNE Small Business’ Top 100 list. “We see this great accomplishment as recognition for VASCO's sustained business success”, said Jan Valcke, VASCO’s President & COO. “This ranking illustrates VASCO’s leading presence as a global market leader in strong authentication.”

Currently, VASCO secures approximately 7,100 companies, including over 1,000 banks, against e-fraud in more than 100 countries.

About VASCO: VASCO is a leading supplier of strong authentication and e-signature solutions and services specializing in Internet Security applications and transactions. VASCO has positioned itself as a global software company for Internet Security serving a customer base of close to 7,100 companies in more than 100 countries, including more than 1000 international financial institutions. VASCO’s prime markets are the financial sector, enterprise security, e-commerce and e-government

Forward Looking Statements:
Statements made in this news release that relate to future plans, events or performances are forward-looking statements. Any statement containing words such as “believes,” “anticipates,” “plans,” “expects,” and similar words, is forward-looking, and these statements involve risks and uncertainties and are based on current expectations. Consequently, actual results could differ materially from the expectations expressed in these forward-looking statements.

Reference is made to the Company's public filings with the US Securities and Exchange Commission for further information regarding the Company and its operations.

For more information contact:
VASCO: Jochem Binst, +32 2 609 97 00, [email protected]