Diversinet's Advanced Wireless Security Enables The World's First Mobile Operator Registration Authority.

TORONTO & HONG KONG SAR, China--(BUSINESS WIRE)--Feb. 5, 2002

Hutchison Telecom - First Appointed Registration Authority For

Hongkong Post Mobile E-Certs

Diversinet Corp. (NASDAQ Small Cap: DVNT), a leading provider of m-commerce security infrastructure solutions, Hutchison Telecommunications (Hong Kong) Limited ("Hutchison Telecom"), the leading mobile operator in Hong Kong, and Hongkong Post, the first recognized public Certification Authority in Hong Kong, announced today that Hutchison Telecom has been appointed the first certified Registration Authority for the registration of Hongkong Post Mobile e-Cert digital certificates to mobile users. This appointment also marks the first time worldwide a mobile operator is acting as a Registration Authority for the issuance of wireless digital certificates.

Commencing today, mobile users can apply for Mobile e-Certs directly from Hutchison Telecom's Customer Services Centres(a). By having Hutchison Telecom as the Registration Authority for the issuance of these certificates, users are provided with greater convenience by saving their time and effort.

Mobile e-Certs are the brand name of the Hongkong Post's wireless digital certificates. The Mobile e-Cert was co-developed by Diversinet and Hongkong Post, utilizing Diversinet's wireless security products. The use of Mobile e-Certs ensures that certificate holders can securely conduct any wireless e-commerce service, such as e-purchase, mobile banking and stock trading. The advanced security features of Mobile e-Certs allow individuals and businesses to authenticate the identity of users, as well as to use digital signatures when conducting high-value transactions.

"We are very honored to be appointed the first Registration Authority by the Hongkong Post, which marks an important milestone in Hong Kong's mobile commerce development," said Agnes Nardi, Managing Director of Hutchison Telecom. "Being the largest mobile operator in Hong Kong with superb network quality, we took the lead in m-commerce development by launching the pioneered mobile banking service, WAP stock trading, WAP bill payment as well as Orange e-shop. The issuance of Mobile e-Certs will be a catalyst for m-commerce adoption. With our soon-to-launch innovative Mobile e-Cert-enabled applications, we are firmly committed to providing our customers with a most secured mobile commerce environment."

"We are pleased that Hutchison shares the same vision with us in promoting the development of secure mobile commerce in Hong Kong and providing a one-stop mobile commerce service to the citizens and businesses in Hong Kong," said P.C. LUK, the Postmaster General.

"We feel this is a great move on Hutchison's part," said Nagy Moustafa, President and CEO, Diversinet Corp. "Not only is Hutchison providing mobile users with another great value-added service by making it easier for them to obtain and use advanced security features in their m-commerce transactions, but they are also making it easier for enterprises and independent application developers. This will ultimately help fuel m-commerce in the Hong Kong region."

Hongkong Post Mobile e-Cert certificates are issued to individuals and business application servers. Mobile users can contact Hutchison Telecom directly for Mobile e-Cert subscription. Hongkong Post will continue to provide the managed security service to generate digital certificates for mobile users.

      (a) Hutchison Telecom's Customer Services Centres:

1. Causeway Bay East Point CS Centre
   17/F East Point Centre, 555 Hennessy Road, Causeway Bay, Hong Kong

2. Mongkok Park-In CS Centre
   12/F Park-In Commercial Centre, 56 Dundas Street, Mongkok, Kowloon

About Hutchison Telecommunications (Hong Kong) Ltd

Hutchison Telecom is the leading and most innovative mobile operator in Hong Kong with the largest subscriber base. The Company is providing the best level of mobile services through first-class network quality, a range of innovative product and service initiatives, as well as the widest coverage on international roaming and international short messaging service. With the award of a 3G license in Hong Kong in October 2001, Hutchison Telecom is firmly committed to the development of a world-class 3G network in Hong Kong, extending its 2G/2.5G technical and service excellence into the 3G era. Hutchison Telecom is actively expanding its portfolio of service offerings in mobile multimedia, high-speed data communications, m-commerce, as well as developing cutting-edge 3G services. For more information about Hutchison Telecom, please visit the Company's website at www.orangehk.com.

About Hongkong Post

To enable the development of electronic commerce in Hong Kong, Hongkong Post has created a public key infrastructure (PKI) and established on 31 January 2000 the first public Certification Authority (CA) in Hong Kong.

As empowered by S34 of the Electronic Transaction Ordinance (ETO), the Postmaster General is a recognised certification authority in Hong Kong. Hongkong Post issues digital certificates, namely Hongkong Post e-Certs, to individuals and businesses to authenticate the identity of the subscribers over the Internet. There are four types of e-Cert, namely Personal, Organisational, Encipherment and Server Certificates. Hongkong Post CA maintains a certificate repository and directory to allow the public to verify the validity of a particular Hongkong Post e-Cert prior to carrying out transactions. These services provide a secure and reliable environment for the conduct of electronic commerce in Hong Kong.

The Hongkong Post e-Cert may be used for commercial operations and secure electronic transactions in the fields of banking, finance, telecommunications, entertainment, education, health etc. The e-Cert also supports the Government's Electronic Service Delivery (ESD) scheme, available since 9 December 2000.

About Diversinet Corp.

Diversinet is a leading developer of advanced wireless security software, enabling mobile e-commerce (m-commerce) services with its wireless security infrastructure solutions. Diversinet's client/server security software facilitates digital signatures, authentication and encryption with PKI products specifically designed to perform optimally in wireless environments and devices. Network Computing's Mobile Observer recently listed Diversinet as one of the top 50 public companies in the mobile and wireless industries. In October of 2001, Diversinet enabled the launch of the first public Certification Authority in the world to offer mobile individual and business digital certificates for consumer use. For more information on Diversinet, visit the company's web site at www.diversinet.com.

The Private Securities Litigation Reform Act of 1995 provides a "safe harbor" for forward-looking statements. Certain information included in this press release (as well as information included in oral statements or other written statements made or to be made by the company) contains statements that are forward-looking, such as statements relating to anticipated future revenues of the company and success of current product offerings. Such forward-looking information involves important risks and uncertainties that could significantly affect anticipated results in the future and, accordingly, such results may differ materially from those expressed in any forward-looking statements made by or on behalf of the company. For a description of additional risks and uncertainties, please refer to the company's filings with the Securities and Exchange Commission.

# of shares issued and outstanding 26,413,876