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Method and apparatus for verifying secure document timestamping

  • US RE41,960 E1
  • Filed: 12/02/2005
  • Issued: 11/23/2010
  • Est. Priority Date: 03/21/1996
  • Status: Expired due to Term
First Claim
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1. A method, comprising:

  • receiving, by a central controller, a timestamp from a caller via a telephone connection;

    receiving, by a central controller, a device identifier from the caller, in which the device identifier identifies a device;

    determining, by a central controller, a cryptographic key based on the device identifier;

    determining, by a central controller, a representation of a time based on the timestamp and the cryptographic key;

    providing, by a central controller, the representation of the time to the caller;

    determining, by a central controller, an account; and

    charging, by a central controller, a fee to the account.

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