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Verification of electronic signatures

  • US 20070220259A1
  • Filed: 03/02/2006
  • Published: 09/20/2007
  • Est. Priority Date: 03/02/2006
  • Status: Active Grant
First Claim
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1. A method of verifying an electronic signature associated with a plurality of timestamps, wherein each timestamp includes a time value, the method comprising:

  • detecting one or more invalid certificates in a certificate chain of the electronic signature;

    selecting an earliest invalidity time of the one or more invalid certificates;

    verifying the timestamps associated with the electronic signature;

    recording the time value of the earliest valid timestamp;

    declaring the electronic signature as valid if the time value of the earliest valid timestamp is earlier than the earliest invalidity time value of the one or more invalid certificates.

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