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Intellectual property (IP) piracy has become a non-negligible problem as theintegrated circuit (IC) production supply chain is becoming increasinglyglobalized and separated that enables attacks by potentially untrustedattackers. Logic locking is a widely adopted method to lock the circuit modulewith a key and prevent hackers from cracking it. The key is the critical aspectof logic locking, but the existing works have overlooked three possiblechallenges of the key: safety of key storage, easy key-attempt from interfaceand key-related overheads, bringing the further challenges of low error rateand small state space. In this work, the key is dynamically generated byutilizing the huge space of a CPU core, and the unlocking is performedimplicitly through the interconnection inside the chip. A novel low-cost logicreconfigurable gate is together proposed with ferroelectric FET (FeFET) tomitigate the reverse engineering and removal attack. Compared to the commonlogic locking methods, our proposed approach is 19,945 times more timeconsuming to traverse all the possible combinations in only 9-bit-keycondition. Furthermore, our technique let key length increases this complexityexponentially and ensure the logic obfuscation effect.

ALL-MASK: A Reconfigurable Logic Locking Method for Multicore Architecture with Sequential-Instruction-Oriented Key