Chinese Journal of Network and Information Security ›› 2021, Vol. 7 ›› Issue (2): 86-93.doi: 10.11959/j.issn.2096-109x.2021024

• Topic: Integrated Circuit Hardware Security • Previous Articles     Next Articles

Novel level shifter based physical unclonable function circuit design

Lijuan HAN1, Lei QIAN1, Enyi YAO2,3, Xin LOU4, Yuan CAO1, Yanhua LIU5   

  1. 1 College of Internet of Things Engineering, Hohai University, Changzhou 213022, China
    2 School of Micro-Electronics, South China University of Technology, Guangzhou 511442, China
    3 Guangdong Artificial Intelligence and Digital Economy Laboratory (Guangzhou), Guangzhou 511442, China
    4 College of Information Science and Technology, Shanghai Tech University, Shanghai 201210, China
    5 Shanghai Institute of Space Power-Sources, Shanghai 200245, China
  • Revised:2021-01-22 Online:2021-04-15 Published:2021-04-01
  • Supported by:
    The Natural Science Foundation of Jiangsu Province, China(BK20191160);Open Research of the State Key Laboratory of Computer Architecture(CARCH201901);QingLan Project;Changzhou Applied Basic Research Plan(CJ20200071);The Special Fund of Changzhou for the Transformation of Scientific and Technological Achievements(2020029)

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Abstract:

Level shifters are widely used in low-power, multi-threshold integrated circuit chips.A novel physical unclonable function (PUF) design based on cross-coupled level shifter was proposed.In this work, a single switching transistor was inserted in the level shifter, which was the only overhead per response bit to change the operation mode of the cross-coupled level shifter from differential to common.The signature of the PUF was extracted while in common mode, by exploiting the uncertainty of the output voltage due to the difference of the switching time of the two PMOS in the cross-coupled network.Simulated with a standard 65 nm CMOS process, the results show the proposed PUF can produce a uniqueness of 49.11% and a reliability of 96.09% with the power supply voltage ranged from 1.0 V to 1.5 V and 95.31% with the temperature ranged from -20 ℃ to 100 ℃.The energy per bit is only 0.72 pJ at a high throughput of 20 Mbit/s (1.2 V, 27 ℃).

Key words: physical unclonable function, process variation, level shifter

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