OPUF: Obfuscation logic based physical unclonable function

Abstract

The Physical Unclonable Function (PUF) has broad application prospects in the field of hardware security. The arbiter PUF is a typical kind of strong PUF. However, due to its deterministic logic, attackers can use modeling techniques to break it in short time. Therefore, this paper proposes an Obfuscation logic based PUF (OPUF) design. A Boolean obfuscation module is proposed to obfuscate the logic which is employed to select the path segments in the arbiter PUF. In this way, the nondeterminacy of PUF is improved, and the computation complexities of modeling attacks are significantly increased, making the OPUF much safer against modeling attack. Both the theoretical analysis and the experimental results show the proposed OPUF design has good stability and randomness.