Patent ID: 8468186
Filing Date: 2013-06-18
Classification: G06F,H04L

Abstract:
1. A device comprising: an input for accepting a challenge value; a pseudo-random source, comprising circuitry for generating one or more device-specific quantities, each quantity depending on device-specific characteristics that vary among like devices formed according to a common design, each of the device-specific quantities representing a degree of comparison of devices-specific characteristics, wherein the circuitry for generating the device-specific quantities includes an output for passing each device-specific quantity as a digital value having a multiple bit representation; circuitry configured to combine the generated device-specific quantities according to a challenge input; a recombination module coupled to the input for accepting the challenge and coupled to the pseudo-random source, the recombination module being configurable according to the challenge value to combine values received from the pseudo-random source according to a combination function dependent on the challenge value to form a combined pseudo-random value; and an output for providing the combined pseudo-random value.