Exhibit 99.01

                                      PROXY

                            ILLUMINET HOLDINGS, INC.

           This proxy is solicited on behalf of the Board of Directors
          for the Special Meeting of Stockholders, December 12, 2001

     The undersigned hereby appoints Richard A. Lumpkin and Roger H. Moore, and
each of them proxies, with full power of substitution and revocation, to vote
the shares of stock of Illuminet Holdings, Inc. which the undersigned is
entitled to vote at the Special Meeting of Stockholders to be held at
Illuminet's Principal executive offices at 4501 Intelco Loop, Lacey, Washinton,
98503 on December 12, 2001 at 9:00 a.m. local time, and at any adjournment
thereof, with all the powers the undersigned would possess if present.

     Please mark your vote, sign, date and return this proxy card promptly in
the enclosed, postage-paid envelope.

     This proxy, when properly executed, will be voted as instructed herein by
the undersigned stockholder. If no instructions are given, this proxy will be
voted "FOR" the proposals herein and according to the discretion of the proxy
holders on any other matters that may properly come before the meeting.

     The Board of Directors recommends a vote FOR Proposals 1 and 2.

     1. To approve the merger of Illinois Acquisition Corporation, a wholly
owned subsidiary of VeriSign, Inc., with and into Illuminet Holdings, Inc. and
to approve and adopt a merger agreement with VeriSign whereby each share of
Illuminet common stock will be exchanged for 0.93 shares of VeriSign common
stock.

    [_]  FOR        [_]  AGAINST   [_]  ABSTAIN


     2. To grant Illuminet management the discretionary authority to adjourn the
special meeting to a date not later than January 11, 2002 in order to enable the
Illuminet board of directors to continue to solicit additional proxies in favor
of the merger.

    [_]  FOR        [_]  AGAINST   [_]  ABSTAIN

     Please sign exactly as your name appears on this proxy. When signing as
attorney, executor, administrator, trustee or guardian, please give full title
as such. If a corporation, please sign in full corporate name by an authorized
officer. If a partnership, please sign in partnership name by an authorized
person.

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                                                  Date

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                                                  Name of Stockholder

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                                                  Authorized Signature

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                                                  Title of Authorized Signature