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In this paper, we present a non-invasive reverse engineering attack based on a novel approach that combines functional and power analysis to recover finite state machines from their synchronous sequential circuit implementations. The proposed technique formulates the machine exploration and state identification problem as a Boolean constraint satisfaction problem and solves it using a SMT (Satisfiability Modulo Theories) solver. It uses power measurements to achieve fast convergence. Experimental results using the LGSynth'91 benchmark suite show that the satisfiability-based approach is several times faster compared to existing techniques and can successfully recover 90%-100% of the transitions of a target machine.

Non-Invasive Reverse Engineering of Finite State Machines Using Power Analysis and Boolean Satisfiability