Low-power sub-threshold design of secure physical unclonable functions
Proceedings of the 16th ACM/IEEE international symposium on Low power electronics and design
Novel physical unclonable function with process and environmental variations
Proceedings of the Conference on Design, Automation and Test in Europe
PHAP: Password based Hardware Authentication using PUFs
MICROW '12 Proceedings of the 2012 45th Annual IEEE/ACM International Symposium on Microarchitecture Workshops
A high reliability PUF using hot carrier injection based response reinforcement
CHES'13 Proceedings of the 15th international conference on Cryptographic Hardware and Embedded Systems
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In this paper we study the effect of transistor supply voltage and body bias on the performance of ring oscillator Physically Uncloneable Functions (PUFs). The uniqueness (ability to identify a PUF) and reproducibility (ability to reproduce the same output) of PUFs increase drastically in the subthreshold region of operation. Also, the reproducibility of PUFs increase when the transistors are forward body biased. A ring oscillator PUF was tested and it achieved a uniqueness of 47.8% and reproducibility of 100% when operating at a supply voltage of 0.2 V. Compared to a base line configuration, our method improved the uniqueness by 18% and reproducibility by 7%. Therefore, apart from architectural optimizations, circuit level considerations like supply voltage and body bias can improve the reliability of PUFs.