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Programmed computer for identity verification, forming joint signatures and session key agreement in an RSA public cryptosystem

  • US 5,905,799 A
  • Filed: 10/15/1996
  • Issued: 05/18/1999
  • Est. Priority Date: 07/20/1994
  • Status: Expired due to Term
First Claim
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1. An article of manufacture for use in a cryptosystem, comprising:

  • computer readable storage medium; and

    computer programming stored on said storage medium;

    wherein said stored computer programming is configured to be readable from said computer readable storage medium by a computer and thereby cause said computer to operate so as to;

    generate a private exponent key, having an associated modulus N of a predetermined bit length, and a corresponding public exponent key;

    divide said private exponent key into a first private key portion, having a bit length of no greater than fifteen percent of the bit length of the associated modulus N but not less than 56 bits, and a second private key portion;

    direct said first private key portion to a first user; and

    direct said second private key portion to a selected one or more other users of the RSA system.

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