Patent ID: 9171144
Filing Date: 2015-10-27
Classification: G06F,G09C,H04L

Abstract:
1. An electronic asymmetric unclonable function applied to an electronic system being evaluated, comprising: the electronic system comprising an integrated circuit; an asymmetric unclonable function array electronically associated with the electronic system, the asymmetric unclonable function array including a plurality of non-identical cells of different constructions including different delay or different structural elements, each of the non-identical cells including a test element comprising an oscillator representing a characteristic of the electronic system being evaluated and a measurement device comprising a binary counter evaluating the test element to provide an output value, the test element of each of the non-identical cells being composed of delay elements and routing structures, wherein each test element of the plurality of non-identical cells incorporate different arrangements of delay elements and routing structures, and wherein a time interval over which the measurement device evaluates operation of the test element is adjusted based on temperature, voltage or age; and a comparison unit processing output values of the measurement device of each of the plurality of non-identical cells to provide a multi-bit output value for each test that represents a magnitude of differences between the plurality of non-identical cells such that the multi-bit output value is applied in comparing integrated circuits to identify differences in the integrated circuits for identification of counterfeit or modified electronics.