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Password-based cryptographic method and apparatus

  • US 8,464,058 B1
  • Filed: 10/27/2008
  • Issued: 06/11/2013
  • Est. Priority Date: 04/08/2008
  • Status: Active Grant
First Claim
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1. A cryptographic method effected between first and second parties acting through respective computing entities, the first party having a specified identity, a secret password, and a long-term password-based public key that is dependent on at least said password and a master secret of the second party;

  • the method comprising;

    the first party generating a short-term random secret x, and then computing and supplying to the second party, a short-term password-based public key that requires for its computation direct knowledge of the first party'"'"'s password and secret x;

    the second party transforming the short-term password-based public key into an element X, complementary to x but from which recovery of x is computationally infeasible, by using its master secret and at least a first-party-specific constituent of the first party'"'"'s long-term password-based public key that is associated with the specified identity of the first party; and

    using the secret x and element X to provide matching keys for the parties.

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