Exhibit 99.1

VASCO Announces Acquisition of Secure Smart Card Reader Specialist,
AOS-Hagenuk

IMPORTANT SYNERGIES BETWEEN DIGIPASS AND AOS-HAGENUK PRODUCT LINES; ACQUISITION
EXPANDS AND STRENGTHENS VASCO SMART CARD READER PRODUCT LINE; ADDS SUBSTANTIAL
DEPTH TO ENGINEERING CAPABILITY AND ACCELERATES GROWTH RATE

OAKBROOK TERRACE, Ill., and BRUSSELS, Belgium, February 8, 2005 - VASCO Data
Security International, Inc. (NASDAQ: VDSI), (www.vasco.com), the global number
one vendor of strong user authentication products to the financial sector, today
announced its acquisition of AOS-Hagenuk of `s-Hertogenbosch, The Netherlands, a
worldwide innovator of security-based Internet appliances and secure smart card
readers (www.aos-hagenuk.com). VASCO will acquire all of the stock of
AOS-Hagenuk, in exchange for consideration totalling Euro 5 million ($6.5
million U.S. dollars using the exchange rate at the date of close), consisting
of Euro 3.75 million cash & Euro 1.25 million VASCO common stock

AOS-Hagenuk is an established, privately-owned company with a growing revenue
base and significant technical expertise in the smart card related e-banking
market. AOS-Hagenuk generated revenues of Euro 4.4 million in 2004 ($5.4 million
U.S. dollars using the average exchange rates for 2004), an eighty-five percent
increase over 2003. AOS-Hagenuk has a strong market position in The Netherlands
and its customers include Fortis and ABN-Amro. AOS-Hagenuk generated modest
operating profits in both 2004 and 2003 and is debt free. AOS-Hagenuk has a
strong installed base of more than 2.5 million smart card based authentication
devices. Although before today VASCO and AOS-Hagenuk were competitors, there is
hardly any overlap in the current product offerings of VASCO & AOS-Hagenuk

With the acquisition of AOS-Hagenuk, VASCO expands and strengthens its product
line and position in the smart card enabled secure e-banking and e-commerce
market. With the addition of AOS-Hagenuk's technical expertise, VASCO expects to
be able to further accelerate its product development and revenue growth.

VASCO will centralize its smart card related R&D activities in AOS-Hagenuk's
offices in The Netherlands, thus creating a secure smart card reader research
and development center focused on smart card technology. VASCO believes that the
combination will allow it to take advantage of current and future opportunities
and evolutions in the global smart card authentication business, including the
emerging EMV (Europay-Mastercard-Visa) environment.

"We welcome AOS-Hagenuk, its products and its people," said Jan Valcke, VASCO's
President and COO. "During our Q3 2004 conference call, we announced that we
would grow our number of employees, our geographical presence, our market
penetration and our product range. With regards to products, we announced that
we would implement a "make or buy" strategy. The acquisition of AOS-Hagenuk
reinforces VASCO's position in the smart card enabled e-banking authentication
market. In addition, AOS-Hagenuk



brings us a number of highly experienced smart card developers, which allows us
to accelerate the development of VASCO's smart card reader offerings and to be
confident about future evolutions in the smart card market. We believe that
there are important synergies between VASCO's Digipass and AOS-Hagenuk's
PocketID unconnected smart card reader."

"The acquisition of AOS-Hagenuk is another excellent example of how VASCO is
executing its growth strategy," said Ken Hunt, VASCO's Chairman and CEO. "AOS is
a profitable company with proven technology and proven success in the market.
With the acquisition of AOS, we are able to expand our product line and customer
base, as well as enhance our technological expertise. We believe that all of
these factors will help accelerate VASCO's growth in revenues and profitability.
With the synergies that exist between the two companies, and the fact that AOS
is a profitable company, we expect that the acquisition will be modestly
accretive in 2005."

"The authentication market has become truly global," said Mladen Filipan, CEO of
AOS-Hagenuk. "Therefore, AOS-Hagenuk has looked for a strong, global partner.
Although AOS-Hagenuk was very well positioned, a strong, international partner
was needed to address the current global authentication & security market. I am
convinced that the combination of the experience, market vision, R&D capacity
and extended product range of both companies will allow them to be successful
all over the world."

Mr Mladen Filipan, CEO of AOS-Hagenuk, will join VASCO as VP Business
Development.



ABOUT VASCO: VASCO designs, develops, markets and supports patented "Identity
Authentication" products for e-business and e-commerce. VASCO's Identity
Authentication software is delivered via its Digipass hardware and software
security products. For user access control, VASCO's VACMAN products guarantee
that only designated Digipass users get access to the application. With over
12,5 million Digipass products sold and ordered, VASCO has established itself as
a world-leader for strong Identity Authentication with over 300 international
financial institutions and approximately 1,400 blue-chip corporations and
governments located in more than 80 countries.

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:
Jochem Binst, +32 2 456 9810, jbinst@vasco.com [mailto:jbinst@vasco.com]
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