Aladdin Knowledge Systems to Participate in Nine Upcoming Investor Conferences in May, June

CHICAGO, May 5, 2005 - Aladdin Knowledge Systems (NASDAQ: ALDN) today announced it will participate in nine upcoming investor conferences throughout May and June of 2005:

• May 11-12, Piper Jaffray Technology Conference-- New York, NY
  

  Yanki Margalit, CEO

• May 15, CIBC Israeli Arena Conference - Tel Aviv, Israel
  

  Yanki Margalit, CEO

• May 16, UBS Israel One-on-One Conference -- London, UK
  

  Erez Rosen, CFO

• May 17, AeA Micro Cap Financial Conference -- San Francisco, CA
  

  Steve Langerock, CEO, Aladdin North America

• May 18, Deloitte Touche Technology & Telco's Conference - Crete, Greece
  

  Erez Rosen, CFO

• May 23, CSFB Security Summit - New York, NY
  

  Yanki Margalit, CEO

• May 24-25, UBS Software & IT Services Conference -- New York, NY
  

  Yanki Margalit, CEO

• June 1, TWST "Investing in Israel" -- New York, NY
  

  Erez Rosen, CFO

• June 2, FBR Growth Conference -- New York, NY
  

  Erez Rosen, CFO

About Aladdin Knowledge Systems

Aladdin Knowledge Systems Ltd. is a global provider of security solutions that reduce software theft, authenticate network users and protect against unwanted Internet and e-mail content, including spam and viruses. Its security products are organized into two segments: Software Digital Rights Management (DRM) and Enterprise Security. Aladdin's Software DRM products allow software publishers to limit revenue loss from software theft and piracy. Its Enterprise Security solutions enable organizations to secure their information technology assets by controlling who has access to their networks (authentication) and what content their users can utilize (content security). Visit the Aladdin Web site at http://www.Aladdin.com.

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