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Fine-grained forward-secure signature scheme

  • US 20060233364A1
  • Filed: 07/07/2003
  • Published: 10/19/2006
  • Est. Priority Date: 07/29/2002
  • Status: Abandoned Application
First Claim
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1. A method comprising providing a secret cryptographic key and a public cryptographic key applicable in a network of connected computer nodes using a signature scheme, the method being executable by a first computer node and the step of providing comprising the steps of:

  • generating the secret cryptographic key by selecting two random factor values, multiplying the two selected random factor values to obtain a modulus value, and selecting a secret base value in dependence on the modulus value, wherein the secret base value forms part of the secret cryptographic key;

    generating the public cryptographic key by selecting a number of exponent values, and deriving a public base value from the exponent values and the secret base value, wherein the public base value and the modulus value form part of the public cryptographic key;

    deleting the two random factor values; and

    providing the public cryptographic key within the network;

    such that the public cryptographic key and at least one of the selected exponent values is usable for verifying a signature value on a message to be sent within the network to a second computer node for verification.

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