Modeling Attack Resistant Arbiter PUF with Time-Variant Obfuscation Scheme

Abstract

Strong PUF represented by arbiter PUF is suitable for the authentication of resource-constrained devices. However, conventional arbiter PUF is vulnerable to modeling attacks due to its linear structure. In this paper, we propose an arbiter PUF with time-variant obfuscation scheme (TVO-APUF), which feeds the external random challenges into the linear feedback shift register (LFSR) module to determine the real challenge of underlying arbiter PUF, thus obfuscating the linear mapping relationship between challenge and response, leading to significant resistance to modeling attacks. In addition, LFSR module with low hardware overhead can be updated at any time to prevent reply attack. We implement a 48-stage TVO-APUF on Xilinx Spartan-6 FPGA board. The experimental results show that the proposed TVO-APUF can effectively resist modeling attacks such as logistic regression (LR), support vector machine (SVM) and evolutionary strategy (ES) with a maximum prediction rate of 53 % and slight effects on uniformity, stability and uniqueness.