Undeniable certificates for digital signature verification

  • US 6,292,897 B1
  • Filed: 11/03/1997
  • Issued: 09/18/2001
  • Est. Priority Date: 11/03/1997
  • Status: Expired due to Term
First Claim
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1. A method for generating an undeniable certificate from a signer to a recipient wherein said signer sends said undeniable certificate thereby eliminating the need for a trusted third partly, said method comprising the steps of:

  • generating a first key pair for an undeniable signature scheme comprising a first private signing key and a corresponding first public verification key, said first public vertification key for verifying undeniable signatures generated under the first private signing key, generating a second key pair for a digital signature scheme comprising a second private signing key and a corresponding second public verification key, said second public verification key for verifying a signature on a message generated with the second private signing key;

    signing said second public verification key by the signer using the first undeniable private signing key to generate an undeniable certificate of the second public verification key;

    sending to the recipient said undeniable certificate of the second public verification key; and

    interacting in a confirmation protocol between said signer and said recipient, said signer needing no prior knowledge of said recipient, using the first undeniable public verification key to verify to the recipient that said undeniable certificate was signed using the first undeniable provide signing key, said recipient accepting or rejecting said undeniable certificate.

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