PHYSICAL UNCLONABLE FUNCTION HARDWARE KEYS UTILIZING KIRCHHOFF-LAW-JOHNSON-NOISE SECURE KEY EXCHANGE AND NOISE-BASED LOGIC

摘要

Weak physical uncloneable function (WPUF) encryption key means that themanufacturer of the hardware can clone the key but anybody else is unable to sothat. Strong physical uncloneable function (SPUF) encryption key means thateven the manufacturer of the hardware is unable to clone the key. In thispaper, first we introduce a "ultra"-strong PUF with intrinsic dynamicalrandomness, which is not only not cloneable but it also gets renewed to anindependent key (with fresh randomness) during each use via the unconditionallysecure key exchange. The solution utilizes the Kirchhoff-law-Johnson-noise(KLJN) method for dynamical key renewal and a one-time-pad secure key for thechallenge/response process. The secure key is stored in a flash memory on thechip to provide tamper-resistance and non-volatile storage with zero powerrequirements in standby mode. Simplified PUF keys are shown: a strong PUFutilizing KLJN protocol during the first run and noise-based logic (NBL)hyperspace vector string verification method for the challenge/response duringthe rest of its life or until it is re-initialized. Finally, the simplest PUFutilizes NBL without KLJN thus it can be cloned by the manufacturer but not byanybody else.