Cryptology ePrint Archive: Report 2019/059

BeSAT: Behavioral SAT-based Attack on Cyclic Logic Encryption

Yuanqi Shen and You Li and Amin Rezaei and Shuyu Kong and David Dlott and Hai Zhou

Abstract: Cyclic logic encryption is newly proposed in the area of hardware security. It introduces feedback cycles into the circuit to defeat existing logic decryption techniques. To ensure that the circuit is acyclic under the correct key, CycSAT is developed to add the acyclic condition as a CNF formula to the SAT-based attack. However, we found that it is impossible to capture all cycles in any graph with any set of feedback signals as done in the CycSAT algorithm. In this paper, we propose a behavioral SAT-based attack called BeSAT. BeSAT observes the behavior of the encrypted circuit on top of the structural analysis, so the stateful and oscillatory keys missed by CycSAT can still be blocked. The experimental results show that BeSAT successfully overcomes the drawback of CycSAT.

Category / Keywords: applications / logic encryption, SAT-based attack, cyclic circuit

Original Publication (with minor differences): Asian South Pacific Design Automation Conference

Date: received 18 Jan 2019

Contact author: haizhou at northwestern edu

Available format(s): PDF | BibTeX Citation

Version: 20190125:215641 (All versions of this report)

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