A Multi-line Arbiter PUF with Improved Reliability and Uniqueness
Jing Wen, Minghui Huang, Ziheng Chen, Lijia Zhu, Shuai Chen, Bing Li · 2019
Physically Unclonable Function (PUF) with non-clonability is mainly studied in two application scenarios of authentication and key generation. As a kind of strong PUF design, APUF (Arbiter-Based Physically Unclonable Function) and its variants have gained wide attention. However, low uniqueness and vulnerability to external environment changes are known as two major problems of APUF implemented on FPGAs. In this paper, we design a multi-line APUF structure with selection function, which based on the proportional relation between reliability and signal delay difference, to improve the reliability. We also replicate multiple same selector pairs of APUF to improve the uniqueness of APUF by reducing bias from ambient noise. From the experimental results on Xilinx Virtex-5 FPGA boards, we show that the uniqueness and steadiness of the responses from our multi-line APUF design is approximately ideal value, which is better than original APUF and DAPUF. It also indicates that this APUF design has high stabilization rate under 0°C to 50°C.