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In this paper, we introduce DFSSD, a novel logic locking solution forsequential and FSM circuits with a restricted (locked) access to the scanchain. DFSSD combines two techniques for obfuscation: (1) Deep Faults, and (2)Shallow State Duality. Both techniques are specifically designed to resistagainst sequential SAT attacks based on bounded model checking. The shallowstate duality prevents a sequential SAT attack from taking a shortcut for earlytermination without running an exhaustive unbounded model checker to assess ifthe attack could be terminated. The deep fault, on the other hand, provides adesigner with a technique for building deep, yet key recoverable faults thatcould not be discovered by sequential SAT (and bounded model checker based)attacks in a reasonable time.

DFSSD: Deep Faults and Shallow State Duality, A Provably Strong Obfuscation Solution for Circuits with Restricted Access to Scan Chain