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Consumable authentication protocol and system

  • US 6,374,354 B1
  • Filed: 03/02/2000
  • Issued: 04/16/2002
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Term
First Claim
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1. A consumable authentication protocol for validating the authenticity of an untrusted authentication chip, the protocol includes the steps of:

  • generating a random number and applying a keyed one-way function to the random number using a first secret key to produce a first outcome, in a trusted authentication chip;

    passing the random number and the first outcome to the untrusted authentication chip;

    applying the keyed one-way function to the random number using the first secret key to produce a second outcome, in the untrusted authentication chip, and then comparing the first and second outcomes;

    in the event that the first and second outcomes match, applying the keyed one-way function to the random number together with a data message read from the untrusted chip using a second secret key to produce a third outcome, in the untrusted chip;

    passing the third outcome together with the data message to the trusted chip;

    applying the keyed one-way function to the random number together with a data message read from the untrusted chip using the second secret key to produce a fourth outcome, in the trusted chip;

    comparing the third and fourth outcomes in the trusted chip, and in the event of a match, considering the untrusted chip and the data message to be valid;

    otherwise considering the untrusted chip and the data message to be invalid.

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