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We propose a secure and lightweight key based challenge obfuscation forstrong PUFs. Our architecture is designed to be resilient against learningattacks. Our obfuscation mechanism uses non-linear feedback shift registers(NLFSRs). Responses are directly provided to the user, without error correctionor extra post-processing steps. We also discuss the cost of protecting ourarchitecture against power analysis attacks with clock randomization, andBoolean masking. Security against learning attacks is assessed using avalanchecriterion, and deep-neural network attacks. We designed a testchip in 65 nmCMOS. When compared to the baseline arbiter PUF implementation, the costincrease of our proposed architecture is 1.27x, and 2.2x when using clockrandomization, and Boolean masking, respectively.

Secure and Lightweight Strong PUF Challenge Obfuscation with Keyed Non-linear FSR