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Method and apparatus for secure document timestamping

  • US 5,923,763 A
  • Filed: 03/21/1996
  • Issued: 07/13/1999
  • Est. Priority Date: 03/21/1996
  • Status: Expired due to Term
First Claim
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1. A device for secure document timestamping, comprising:

  • a time generator for transmitting a representation of a time;

    a computing device, including a computer processor and a memory, coupled to receive the representation of the time from the time generator and programmed to perform a cryptographic operation on the representation of the time to produce a timestamp;

    an output device, coupled to the computing device, for outputting the timestamp in optically detectable form in response to a timestamp request; and

    means for rendering at least one of the time generator and the computing device resistant to tampering.

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