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Authentication of integrated circuits

  • US 7,840,803 B2
  • Filed: 04/04/2003
  • Issued: 11/23/2010
  • Est. Priority Date: 04/16/2002
  • Status: Active Grant
First Claim
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1. A method for authentication of a first device from a group of devices fabricated based on a common design, each device implementing a first function the method comprising:

  • authenticating the first device by application of the first function whose output depends on an applied multiple bit digital input and on a fabrication characteristic of an integrated circuit that varies among devices in the group of devices as a result of random variations in fabrication of the integrated circuits of the devices, includingreceiving a signal at the first device that encodes a first identifier,applying a one-way function using the first identifier as an argument to produce an output of the one-way function, andapplying the first function to the output of the one-way function.

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