DIVERSINET JOINS WAP FORUM TO HELP CREATE GLOBAL SECURITY STANDARDS FOR WIRELESS MARKET

Diversinet to Work with Wireless Application Protocol Organization To Spark Wireless Electronic Commerce Through Public Key Encryption

Toronto, Canada, July 20, 1999 - Diversinet Corp. (NASDAQ Small Cap: DVNT, CDN: DVNT), a leader in providing security solutions for wireless e-commerce, today announced it has joined the Wireless Application Protocol (WAP) Forum. The WAP Forum includes wireless industry leaders such as Ericsson, Nokia, Motorola and Phone.com. WAP is the de-facto worldwide standard for providing Internet communications and advanced data services on digital mobile phones, pagers, personal digital assistants and other wireless devices.

Diversinet intends to work closely with the WAP Forum and the WAP Security Group to create its standards-based security solutions developed in an open forum as the marketplace has come to expect. The company is one of the first WAP Forum members to provide security solutions based on PKI (public key infrastructure) technology.

Diversinet helps make wireless e-commerce a reality by providing client/server security software optimized for critical applications, such as banking, stock trading, retail purchases, discount coupons and promotions. These applications are driving the international market for the Internet-enabled wireless products.

"Wireless subscribers in the United States, Europe and Asia are already trading stocks, accessing their bank balances and receiving promotional offers over pagers and mobile phones, " says Nagy Moustafa, president and CEO of Diversinet. "However, for the advantages of real-time e-commerce to reach hundreds of millions of people around the world, it�s crucial to provide complete security for wireless transactions," Moustafa says. "Diversinet can provide end to end security through our patented Public Key Infrastructure (PKI)."

"We are pleased that Diversinet has chosen to join the WAP Forum", commented Chuck Parrish, Executive Vice-President of Phone.com and Vice Chairman of the WAP Forum Board of Directors. "Security is a critical consideration in wireless e-commerce and Diversinet is positioned to contribute to the WAP Forum�s efforts in this regard."

Diversinet�s Passport Certificate Server™ enables organizations to efficiently manage their own public key systems. The Passport Certificate Server�s low-memory certificates, online validation and registration authority make it ideal for implementing wireless security solutions.

The software is designed to effectively leverage the limited memory, processing power, battery life and data rates of wireless products. Diversinet�s Root Certificate Rollover™ technology helps solve the problem of root certificate management for handheld devices.

About Diversinet
Diversinet Corp. (http:\\www.dvnet.com) is a leading developer of products based on public-key technology for securing wireless and wireline e-commerce applications. Diversinet�s authentication product, the Passport Certificate Server, is designed for resource-constrained devices. The Passport Authorization product extends the functionality of digital certificates by issuing a Digital Permit that, when used in conjunction with a certificate, serves to identify what privileges the authenticated entity is allowed to undertake.

About the WAP Forum
The WAP Forum is an industry association that has developed the de-facto world standard for wireless information and telephony services on digital mobile phones and other wireless terminals. Handset manufacturers representing 95 percent of the world market across all technologies have committed to shipping WAP-enabled devices. Carriers representing more than100 million subscribers worldwide have joined WAP. These commitments will put 10's of millions of WAP-browser-enabled products in consumer hands by the end of 2000. WAP Forum membership is open to all industry participants. For further details on the WAP Forum and its members, please visit the Forum's Web site at www.wapforum.org. The Web site also includes a downloadable version of WAP V1.1.

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This press release may contain forward-looking statements relating to Diversinet. Among the important factors that could cause the actual results to differ materially from those indicated by such forward-looking statements are delays in product developments, undetected software errors and bugs, competitive pressures, technical difficulties, market acceptance, changes in customer requirements and general economic conditions. All other companies and products listed herein may be trademarks or registered trademarks of their respective holders.