Exhibit 99.1

JEAN K. HOLLEY ELECTED TO BOARD OF VASCO DATA SECURITY INTERNATIONAL, INC.

EVP AND CIO OF TELLABS TO ADD BROAD TECHNICAL EXPERTISE AND KNOWLEDGE TO VASCO'S
BOARD OF DIRECTORS

OAKBROOK TERRACE, Illinois, and BRUSSELS, Belgium - August 2, 2006 - VASCO Data
Security International Inc. (Nasdaq: VDSI; www.vasco.com), the global number one
vendor of strong user authentication and e-signature products, announced today
that Jean K. Holley has been elected to VASCO's Board of Directors.

Ms. Holley, 47, is the Executive Vice President and Chief Information Officer
for Tellabs. Ms. Holley is responsible for setting and implementing an IT
strategy for the company's global operations. This includes worldwide IT
operations, acquisition integration, supply chain optimization, e-commerce,
customer relationship management and the extension of consolidation and
standards across the company.

Previously, Ms. Holley served as VP and CIO for USG Corporation, where she was
the company's first woman corporate officer and first CIO. She established and
implemented an IT strategy that included: Supply Chain Management (SCM),
Customer Relationship Management (CRM), e-commerce strategy, implementation,
operations and strategic outsourcing.

Ms. Holley has served as Sr. IT Director for Waste Management, Sr. IT Director
for Rust Industrial Services and IT Director for Waste Management's
Environmental Monitoring Labs. She has also held positions at Digital Equipment
Corporation and Inland Steel.

In 2002, Ms. Holley received the Spotlight Award from the Chicago Software
Association and was listed by ComputerWorld as one of the top 100 CIOs. Ms.
Holley has also received the "CIO of the Year" award by the Association of IT
Professionals (AITP).

Ms. Holley holds a BS in Computer Science/Electrical Engineering from the
University of Missouri-Rolla, and a MS in Computer Science/Engineering from
Illinois Institute of Technology in Chicago. She has served on a variety of
boards including Blue Wolff, Illinois Institute of Technology, Northern Illinois
University's College of Engineering & Engineering Technology, University of
Missouri - Rolla's College of Mines & Metallurgy, and the School of Management
Information Systems. She served as President of the Academy for Computer Science
at UMR and is a current Board member for Junior Achievement. Finally, she serves
as a Board member for Giant Steps of Illinois, an autistic school for children
with autistic spectrum disorders.

"We are very pleased to have Jean join VASCO's Board of Directors," stated T.
Kendall Hunt, VASCO's Chairman & CEO. "Her technical knowledge and contacts in
the telecommunications industry will serve VASCO well. Additionally, Jean will
help our Board and Company better understand and anticipate current and future
technology trends to aid us in strategic planning and actions."

Ms. Holley commented, "I am very excited to be associated with a company that is
focused on the high-growth information security industry. Identity theft is a
significant and growing problem. VASCO's products and solutions to address this
issue are driving its rapid global growth. I look forward to working with the
management team and Board of VASCO as they plan for and manage their future
growth."

About VASCO: VASCO designs, develops, markets and supports patented user
authentication products for the financial world, remote access, e-business and
e-commerce. VASCO's user authentication software is delivered via its Digipass
hardware and software security products. With over 25million Digipass products
sold and delivered, VASCO has established itself as a world-leader for strong
User Authentication with over 500 international financial institutions and
approximately 3,000 blue-chip corporations and governments located in more than
80 countries.

                                  END OF FILING