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Data protection and cryptographic functions using a device-specific value

  • US 7,818,569 B2
  • Filed: 06/01/2006
  • Issued: 10/19/2010
  • Est. Priority Date: 04/16/2002
  • Status: Active Grant
First Claim
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1. A method comprising:

  • generating a digital value in an integrated circuit that depends on circuit characteristics that vary due to fabrication variations among a plurality of like integrated circuits; and

    applying a data access function that uses as an input the generated digital value to access protected information stored in the integrated circuit;

    wherein the steps of generating the digital value and using the digital value are repeated without requiring storage of the digital value between repetitions.

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