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Digital Signature Trust to Demonstrate End-to-End Secure Wireless Communications at RSA 2000 Conference

               DST Teams with Diversinet and Research In Motion
               To Put the Power of PKI in the Palm of the Hand

    SAN JOSE, Calif., Jan. 17 /PRNewswire/ -- Digital Signature Trust Co.
(DST), an affiliate of Zions Bancorporation (Nasdaq: ZION) and the first
licensed certification authority (CA) in the United States, will demonstrate
secure wireless e-mail at the RSA 2000 Conference this week in San Jose,
Calif. (Booth #1110).
    Using the BlackBerry(TM) wireless handheld from Research In Motion Limited
(Nasdaq: RIMM) (Toronto: RIM), integrated with Diversinet Corp.'s
(Nasdaq: DVNT) (CDN: DVNT) client/server security solutions, DST will
demonstrate elliptic-curve Public Key Infrastructure (PKI) to encrypt the
wireless message.  Elliptic-curve public key cryptography provides a much
smaller key size and faster compute times compared to RSA cryptography, which
is commonly used in desktop security, making it a much more compatible method
for small, hand-held devices.
    "We believe this to be the first-ever demonstration of end-to-end wireless
communication in a PKI-based secure environment," said Scott Lowry, president
and chief executive officer of DST.  "Having gotten over the technological
hurdle of providing wireless, mobile e-mail, the next big question has been
how to secure the communication.  We have the solution."
    Also at its RSA 2000 booth, DST will offer conference-goers free
authenticated digital certificates on a variety of secure hardware devices,
including smart cards and USB Tokens.  These DST-issued certificates carry a
full one-year validity and robust authentication for identifying a person in
an electronic transaction.

    About Digital Signature Trust
    Digital Signature Trust Co. is a subsidiary of Zions First National Bank
and is the first licensed Certification Authority in the U.S.  DST helps
government and industry clients benefit from savings and service opportunities
offered by the Internet through providing trusted, PKI-based digital
certificate services and secure electronic commerce solutions.  DST also
offers certification authority and repository services, business process
re-engineering, and PKI consulting.  With a focus on implementing PKIs that
meet individual client needs, DST offers a variety of PKI solutions backed by
leading technology providers.  DST creates the trust that allows organizations
to fully benefit from electronic commerce.  Among the customers who trust
their business to DST, the U.S. General Services Administration awarded DST
the first Access Certificates for Electronic Services (ACES) contract to issue
digital certificates to the American public on behalf of government agencies.
For more information, call DST at 1-888-294-7831 or visit
http://www.digsigtrust.com .  Zions First National Bank is the largest
subsidiary of Zions Bancorporation.

    BlackBerry, RIM and Research In Motion are trademarks or registered
trademarks of Research In Motion Limited.


SOURCE Digital Signature Trust Co.




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    Company News On-Call:
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    800-758-5804, ext. 988950
    CONTACT:
    Wendy Steinle of Digital Signature Trust Co.,
    801-594-8027, or wendy.steinle@digsigtrust.com