A Lightweight XOR-PUF Structure for Resource Constrained Smart Device
Huan Li, Yu Jeong Jin, Han Kedu, Duli Yu · 2019
Physical unclonable function(PUF) circuits provide unique, random and unclonable secret keys by extracting random process deviations in the manufacturing process of integrated circuits. Many efforts has been devoted in recent years to make PUF structure more vulnerable to external modelling attacks. For instance, as a strong PUF structure, several same arbiter-PUFs circuits are duplicated and combined with XOR to introduce extra nonlinearity to the response sequence. Although XORPUF improves the unpredictability of the circuit, however, over the 6 duplications and corresponding area overheads are needed for low prediction rate around 50%. In this paper, an advanced PUF circuit which employs XORPUF structure with less area overheads is proposed and established on 28nm FPGA evaluation board. The machine learning attack results to the proposed PUF structured demonstrate the improvement in the attack resistance, as well as the uniqueness and reliability of the response sequence.