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User authentification using a virtual private key

  • US 6,189,096 B1
  • Filed: 08/06/1998
  • Issued: 02/13/2001
  • Est. Priority Date: 05/06/1998
  • Status: Expired due to Fees
First Claim
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1. A method of authentication, comprising:

  • obtaining a user private key from a user;

    retrieving an encrypted client secret key value associated with said user;

    decrypting said encrypted user secret key value using said user private key to provide a client secret key;

    computing a preliminary digest of;

    a first time stamp, a user certificate serial number associated with said user, and said client secret key;

    providing an unencrypted message including said first time stamp, said user certificate serial number, and said preliminary digest;

    retrieving an encrypted server secret key value associated with said user certificate serial number of said unencrypted message;

    decrypting said encrypted server secret key value using a server private key to provide a server secret key;

    computing a computed digest of;

    said first time stamp of said unencrypted message, said user certificate serial number of said unencrypted message, and said server secret key; and

    determining said present message to be authentic based on a comparison between said preliminary digest of said unencrypted message and said computed digest.

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