Memory Chip Identification via Mismatch Bit Fingerprinting

The patent converts the harmful effect of production variability into a beneficial unique identifier. By measuring the specific pattern of mismatch bits caused by manufacturing variations in each memory chip, the system creates a distinctive fingerprint that identifies individual devices. This transforms the problem of unreproducibility into a solution for unique device identification and authentication.

The patent replaces traditional mechanical or software-based identification methods with a physics-based identification system. Instead of using programmable identifiers that can be copied or altered, the system uses the inherent physical characteristics of the memory device itself—specifically the random mismatch bit patterns resulting from manufacturing variations—as the identification basis. This physical foundation provides superior security against unauthorized replication.

The patent performs the identification-critical write operation only once during device initialization or authentication setup. The resulting mismatch bit pattern is then stored and used for subsequent identification without requiring repeated writes. This preliminary action approach achieves accurate identification while minimizing wear-inducing operations, thereby extending device lifespan.