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arXiv · 2201.05943

TriLock: IC Protection with Tunable Corruptibility and Resilience to SAT and Removal Attacks

Yuke Zhang·Yinghua Hu·Pierluigi Nuzzo·Peter A. Beerel
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Abstract

Sequential logic locking has been studied over the last decade as a method to protect sequential circuits from reverse engineering. However, most of the existing sequential logic locking techniques are threatened by increasingly more sophisticated SAT-based attacks, efficiently using input queries to a SAT solver to rule out incorrect keys, as well as removal attacks based on structural analysis. In this paper, we propose TriLock, a sequential logic locking method that simultaneously addresses these vulnerabilities. TriLock can achieve high, tunable functional corruptibility while still guaranteeing exponential queries to the SAT solver in a SAT-based attack. Further, it adopts a state re-encoding method to obscure the boundary between the original state registers and those inserted by the locking method, thus making it more difficult to detect and remove the locking-related components.

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Yuke Zhang, Yinghua Hu, Pierluigi Nuzzo, Peter A. Beerel. 2022-01-16. TriLock: IC Protection with Tunable Corruptibility and Resilience to SAT and Removal Attacks. https://arxiv.org/abs/2201.05943

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