A lightweight and collapse-response-resistant PUF using obfuscation-feedback-shift-register

Physical Unclonable Function (PUF) is a lightweight hardware security primitive and suitable for device authentication in Internet of Things (IoT). However, each strong PUF instance is required to store at least 10^6 reliable challenge-response pairs (CRPs) in the center nodes, which brings an excessive storage overhead since such nodes connect massive remote PUFs. In this paper, an obfuscation-feedback-shift-register (OFSR) PUF is designed, which consists of certain numbers of weak PUF cells working with an obfuscation mechanism. It can efficiently overcome the collapse response resulted from normal linear-feedback-shift-register (LFSR), and provide higher security. Experimental results show that the proposed PUF has ideal performance on reliability, uniqueness, uniformity, randomness, and good resistance to machine learning attacks.