Cryptology ePrint Archive: Report 2017/348

Removal Attacks on Logic Locking and Camouflaging Techniques

Muhammad Yasin and Bodhisatwa Mazumdar and Ozugr Sinanoglu and Jeyavijayan Rajendran

Abstract: With the adoption of a globalized and distributed IC design flow, IP piracy, reverse engineering, and counterfeiting threats are becoming more prevalent. Logic obfuscation techniques including logic locking and IC camouflaging have been developed to address these emergent challenges. A major challenge for logic locking and camouflaging techniques is to resist Boolean satisfiability (SAT) based attacks that can circumvent state-of-the-art solutions within minutes. Over the past year, multiple SAT attack resilient solutions such as Anti-SAT and AND-tree insertion (ATI) have been presented. In this paper, we perform a security analysis of these countermeasures and show that they leave structural traces behind in their attempts to thwart the SAT attack. We present two attacks, namely “signal probability skew” (SPS) attack and “sensitization guided SAT” (SGS) attack, that can break Anti-SAT and ATI, respectively, within minutes.

Category / Keywords: implementation / hardware security, logic obfuscation, IP piracy, reverse eningeering, IC camouflaging, logic locking, removal attack

Date: received 19 Apr 2017

Contact author: yasin at nyu edu

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Version: 20170426:171733 (All versions of this report)

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