Estimation during Design Phases of Suitable SRAM Cells for PUF Applications Using Separatrix and Mismatch Metrics

• URL: http://arxiv.org/abs/2412.01560v1
• Date: Mon, 02 Dec 2024 14:47:37 GMT
• Title: Estimation during Design Phases of Suitable SRAM Cells for PUF Applications Using Separatrix and Mismatch Metrics
• Authors: Abdel Alheyasat, Gabriel Torrens, Sebastia A. Bota, Bartomeu Alorda,
• Abstract summary: Physically unclonable cryptographic functions (PUFs) are used as low-cost primitives in device authentication and secret key creation. Due to non-deterministic noise environment during the power-up process, PUFs are subject to low challenge-response repeatability.
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• Abstract: Physically unclonable functions (PUFs) are used as low-cost cryptographic primitives in device authentication and secret key creation. SRAM-PUFs are well-known as entropy sources; nevertheless, due of non-deterministic noise environment during the power-up process, they are subject to low challenge-response repeatability. The dependability of SRAM-PUFs is usually accomplished by combining complex error correcting codes (ECCs) with fuzzy extractor structures resulting in an increase in power consumption, area, cost, and design complexity. In this study, we established effective metrics on the basis of the separatrix concept and cell mismatch to estimate the percentage of cells that, due to the effect of variability, will tend to the same initial state during power-up. The effects of noise and temperature in cell start-up processes were used to validate the proposed metrics. The presented metrics may be applied at the SRAM-PUF design phases to investigate the impact of different design parameters on the percentage of reliable cells for PUF applications.

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