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Method and arrangement for generating and checking a security imprint

  • US 5,953,426 A
  • Filed: 02/11/1997
  • Issued: 09/14/1999
  • Est. Priority Date: 02/11/1997
  • Status: Expired due to Term
First Claim
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1. A method for verifying data formed by a plurality of characters in an indicium comprising characters readable by an optical character reader, comprising the steps of:

  • reading characters in an indicium using an optical character reader;

    retrieving a DES key from a database using a vendor identifier and a device identifier;

    computing a MAC dependent on said characters read by said optical character reader and said DES key;

    identifying an MAC from the characters read by said optical character reader;

    comparing the computed MAC with the MAC read from said indicium; and

    acknowledging validity of said indicium given identity of the computed MAC and the MAC obtained from the indicium.

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