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System and method of verifying cryptographic postage evidencing using a fixed key set

  • US 6,058,193 A
  • Filed: 06/28/1999
  • Issued: 05/02/2000
  • Est. Priority Date: 12/23/1996
  • Status: Expired due to Term
First Claim
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1. A method for providing keys used in the verification of encoded information generated by a transaction evidencing device and printed on a document, the method comprising the steps of:

  • generating a plurality of random verifier master keys to obtain a set of verifier master keys consisting of a fixed number of keys;

    generating at least one pointer by applying a psuedorandom algorithm to data unique to the transaction evidencing device;

    calculating a plurality of verifier token keys to obtain a verifier token key set corresponding to the set of verifier master keys; and

    distributing the verifier token key set to verifiers.

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