Patent Document ID: 7565541
Application ID: 09598793
Patent Status: 1

Claim One:
1. A method for resolving the most probable digital fingerprint from a circuit, the circuit outputting a digital fingerprint comprising a series of bits, the method comprising the steps of: (a) polling the circuit, the circuit being disposed on a silicon die and comprising two or more devices formed on the silicon die, for a digital fingerprint, the digital fingerprint being based at least in part on an electrical characteristic of the two or more devices of the circuit due to a process by which the silicon die was manufactured, wherein the digital fingerprint comprises at least two sections, each section comprising a series of bits; (b) recording the digital fingerprint; (c) repeating steps (a) and (b) a desired number of times to result in one or more fingerprinting values for a corresponding iteration of said polling and said recording; (d) calculating a most probable digital fingerprint from the one or more fingerprinting values yielded in steps (a)-(c); (e) calculating a stability value of each bit in said digital fingerprint; and (f) for each section, storing the stability value of the least stable bit in each section in association with a section identifier and the most probable digital fingerprint calculated in step (d).