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Hardware based cryptography

  • US 8,379,856 B2
  • Filed: 06/17/2009
  • Issued: 02/19/2013
  • Est. Priority Date: 06/17/2009
  • Status: Expired due to Fees
First Claim
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1. A method for exchanging a shared secret using a hardware public physically unclonable function, the method comprising:

  • receiving a simulated output of the hardware public physically unclonable function;

    loading at least one of a pool of possible initial values into an input register associated with thehardware public physically unclonable function;

    coupling logic signals corresponding to the loaded values from the input register into the hardware public physically unclonable function;

    propagating the logic signals through the hardware public physically unclonable function so as to generate a second set of logic signals from the coupled logic signals;

    latching the second set of logic signals from the hardware public physically unclonable function into an output register;

    comparing the latched output register with the received simulated output; and

    identifying the loaded initial value as the shared secret in response to the latched output register matching the received simulated output.

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