| |  |  | If the following press is true, why did Lachman ask to have DVNT deliver Ruth Apfel shares to Ringfeld? 
 Diversinet Raises U.S. $2.3 Million Through the Exercise of a Warrant
 
 TORONTO--(BUSINESS WIRE)--Dec. 8, 1999--Diversinet Corp. (Nasdaq:DVNT)(CDN:DVNT), a leading
 provider of security solutions for wireless e-commerce, today announced that it has raised gross proceeds of U.S.
 $2.3 million from 900,000 common shares issued upon the exercise of a warrant.
 
 The warrant was previously issued in connection with a private placement completed by the company in December
 1997. The shares were issued to Knockagh International Ltd., that as of today owns approximately 1,350,000, or
 6.2% of Diversinet Corp.'s issued and outstanding common shares.
 
 In October 1996, Diversinet acquired from Knockagh the technology that is used in the company's current product
 line.
 
 Diversinet currently has approximately CDN $10 million in cash and short-term deposits.
 
 About Diversinet Corp.
 
 Diversinet Corp. (NASDAQ Small Cap: DVNT, CDN: DVNT) is a leading developer of security products based on
 public-key technology for wireless e-commerce applications, such as banking, stock trading, financial analysis and
 healthcare databases. Diversinet's innovative Passport(TM) software, including authentication, digital certificates,
 digital signatures and digital permits, is especially designed for resource-constrained products, such as pagers,
 wireless phones and smart cards. Diversinet is a WAP Forum member. Web site: dvnet.com.
 
 This press release may contain forward-looking statements. Among the important factors that could cause the actual
 results to differ materially form 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.
 
 CONTACT:
 
 Diversinet Corp., Toronto
 
 Ralph Philipps, 416/756-2324 x231
 
 rphilipps@dvnet.com
 
 or
 
 The Investor Relations Group, New York
 
 Dian Griesel, Ph.D., 212/736-2650
 
 TheProTeam@aol.com
 
 KEYWORD: INTERNATIONAL CANADA
 
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