Work

Hardware Security for Edge Computing Via CMOS‐Compatible Multi‐Level Flash Memory with Hash‐Based Key Generation

Year: 2025

Type: article

Abstract: Ensuring secure and energy‐efficient authentication of resource‐constrained devices has become a critical challenge owing to the rapid expansion of the Internet of Things (IoT) ecosystem. Physically unclonable functions (PUFs) that exploit inherent manufacturing variations to generate device‐unique keys have emerged as a promising hardware‐based security primitive. In this study, a PUF architecture is proposed that utilizes multi‐level programming of flash memory capacitors. Reliable and reproducible binary responses are generated across multiple programmed states by extracting flat‐band voltage variations from capacitance–voltage measurements. Performance is evaluated using the uniformity, P ‐value, inter‐Hamming distance, and intra‐Hamming distance, which indicated strong randomness, uniqueness, and stability. To further enhance the entropy and cryptographic strength, a hash‐based message authentication code (HMAC)‐based key derivation function is integrated, which transformed the PUF outputs into high‐entropy pseudorandom keys. The final architecture supported key generation with zero standby power and is compatible with commercially available memory structures, thereby enabling low‐cost and scalable deployment in secure IoT systems. These results highlight the potential of multi‐level memory‐based PUFs as a lightweight and robust solution for next‐generation hardware security.

Source: Advanced Electronic Materials

DOI: 10.1002/aelm.202500484