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Method and apparatus for personal identification

  • US 5,367,572 A
  • Filed: 07/31/1992
  • Issued: 11/22/1994
  • Est. Priority Date: 11/30/1984
  • Status: Expired due to Term
First Claim
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1. A system for verifying an individual, the system being of the type wherein a user is provided with a nonsecret identification, with a secret PIN and with a user device generating a unique, time-varying, nonpredictable code, the nonpredictable code at a given time being provided to a central verification computer to effect verification, the system characterized by:

  • the user device having means for inputting the PIN, and means for utilizing the PIN in an algorithm to produce the nonpredictable code for a given time interval; and

    the central verification computer having means for receiving the nonsecret identification and the nonpredictable code produced at the user device, means for utilizing the nonsecret identification to obtain the time-varying nonpredictable code for the user for the given time interval, and means for utilizing the communicated nonpredictable code and the obtained nonpredictable code to verify the user.

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