RETENTION BASED INTRINSIC FINGERPRINT IDENTIFICATION FEATURING A FUZZY ALGORITHM AND A DYNAMIC KEY

摘要

A random intrinsic chip ID generation employs a retention fail signature. A 1st and 2nd ID are generated using testing settings with a 1st setting more restrictive than the 2nd, creating more fails in the 1st ID bit string 275 that includes 2nd ID bit string 290. A retention pause time controls the number of retention fails, adjusted by a BIST engine 625, wherein the fail numbers 803, 920 satisfy a predetermined fail target. Verification confirms whether the 1st ID includes the 2nd ID bit string, the ID being the one used for authentication. Authentication is enabled by a 3rd ID with intermediate condition such that 1st ID includes 3rd ID bit string and 3rd ID includes 2nd ID bit string. The intermediate condition includes a guard-band to eliminate bit instability problem near the 1st and 2nd ID boundary. The intermediate condition is changed at each ID read operation, resulting in a more secure identification.