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Locking of an integrated circuit

  • US 8,745,107 B2
  • Filed: 09/27/2005
  • Issued: 06/03/2014
  • Est. Priority Date: 09/28/2004
  • Status: Active Grant
First Claim
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1. A method for protecting an integrated circuit, the method comprising:

  • using the integrated circuit to receive a key generated outside of said integrated circuit,recording the key in non-volatile fashion in the circuit subsequent to manufacturing the integrated circuit,using the integrated circuit to perform a calculation having as operands at least the key and a parameter intrinsically present in the integrated circuit in non-volatile fashion at the end of the manufacturing, the calculation producing a result having a value dependent on values of the key and the parameter, the calculation being invertible to produce the value of the key using the values of the result and the parameter;

    using the integrated circuit to determine whether the value of the result matches a stored value; and

    when the integrated circuit determines that the value of the result matches the stored value, activating at least a part of the integrated circuit.

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