Authentication of integrated circuits
First Claim
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1. An integrated circuit device comprising circuitry for repeated generation of a cryptographic key that depends on fabrication characteristics of the integrated circuit and a multiple bit challenge value, said circuitry comprising:
- oscillation circuitry comprising a plurality of oscillators for providing a plurality of oscillatory signals, oscillation frequencies of the oscillatory signals being dependent on fabrication characteristics of the oscillation circuitry and on the multiple bit challenge value;
combination circuitry for processing the oscillatory signals and producing outputs each dependent on multiple of the plurality of oscillatory signals; and
a key generator for assembling the cryptographic key to depend on the outputs of the combination circuitry.
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Abstract
A group of devices are fabricated based on a common design, each device having a corresponding plurality of measurable characteristics that is unique in the group to that device, each device having a measurement module for measuring the measurable characteristics. Authentication of one of the group of devices is enabled by selective measurement of one or more of the plurality of measurable characteristics of the device.
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Citations
15 Claims
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1. An integrated circuit device comprising circuitry for repeated generation of a cryptographic key that depends on fabrication characteristics of the integrated circuit and a multiple bit challenge value, said circuitry comprising:
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oscillation circuitry comprising a plurality of oscillators for providing a plurality of oscillatory signals, oscillation frequencies of the oscillatory signals being dependent on fabrication characteristics of the oscillation circuitry and on the multiple bit challenge value; combination circuitry for processing the oscillatory signals and producing outputs each dependent on multiple of the plurality of oscillatory signals; and a key generator for assembling the cryptographic key to depend on the outputs of the combination circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 15)
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10. A method for repeated generation of a cryptographic key that depends on fabrication characteristics of an integrated circuit comprising:
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operating a plurality of oscillators to provide a plurality of oscillatory signals, oscillation frequencies of the oscillatory signals being dependent on fabrication characteristics of the oscillation circuitry and on a multiple bit challenge value; combining quantities representing oscillation frequencies of the oscillatory signals to produce outputs each dependent on multiple of the plurality of oscillatory signals; and assembling a cryptographic key to depend on the outputs of the combining. - View Dependent Claims (11, 12, 13, 14)
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Specification