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Apparatus and method for proving the denial of a direct proof signature

  • US 7,490,070 B2
  • Filed: 06/10/2004
  • Issued: 02/10/2009
  • Est. Priority Date: 06/10/2004
  • Status: Active Grant
First Claim
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1. A method comprising:

  • convincing a verifier that an anonymous hardware device possesses cryptographic information without disclosure of the cryptographic information to the verifier;

    receiving a denial of signature request, including a base value B0 and a pseudonym value K0 of a suspect signature from the verifier;

    convincing the verifier that a cryptographic key, F, stored within the anonymous hardware device and used to construct a pseudonym, K, does not match an unknown, suspect key F0 used to form the suspect signature, to prove to the verifier that the cryptographic key, F, stored within the anonymous hardware device is uncompromised without disclosure of the cryptographic key or any unique device identification information of the hardware device to the verifier to enable the hardware device to remain anonymous to the verifier.

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