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Desinated-confirmer signature systems

  • US 5,373,558 A
  • Filed: 05/25/1993
  • Issued: 12/13/1994
  • Est. Priority Date: 05/25/1993
  • Status: Expired due to Term
First Claim
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1. A method for public-key digital authentication of messages, comprising the steps of:

  • creating a private key by a signing party;

    making a public key, corresponding to said private key of said signing party, verifiable by at least a receiving party;

    creating a private key by a confirming party and keeping the private key substantially unavailable to at least said receiving party;

    making a public key, corresponding to said private key of said confirming party, verifiable by at least said receiving party;

    communicating data including a signature between said signing and said receiving parties, where (a) the data is convincing to the receiving party that, by use of said private key corresponding to said public key of said confirming party, other parties can be convinced that the signature was made by the signing party, and (b) where it is substantially infeasible for the receiving party, for so long as the private key corresponding to the public key of the confirming party is unavailable to the receiving party, to convince other parties of the signature by the signing party.

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