期刊
出版社
IEEE
DOI: 10.1109/ISCAS.2018.8351601
关键词
Physical Unclonable Function (PUF); Successive Approximation (SAR) ADC; capacitance variation; charge redistribution
资金
- National Science Foundation [CNS-1441639]
- Semiconductor Research Corporation [2014-TS-2560]
- Division Of Computer and Network Systems
- Direct For Computer & Info Scie & Enginr [1441639] Funding Source: National Science Foundation
A Physical Unclonable Function (PUF) using capacitor mismatch in a standard successive approximation register analog-to-digital converter (SAR-ADC) as the entropy source is demonstrated in 65nm CMOS. SAR-ADCs are readily available in many system-on-chips, making the hardware overhead of the proposed PUF almost negligible. The inherent process variation of metal-oxide-metal (MOM) capacitors is harnessed through a charge redistribution operation which is sampled by the voltage comparator. To enhance the stability of the PUF output, soft response generation and dynamic thresholding techniques were adopted. Finally, we verify that performing the enrollment operation at a lower operating voltage can ensure that PUF responses are stable at the nominal supply voltage used during authentication.
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