Reverse engineering attack on minterm-camouflaged circuit

To further enhance the security of the minterm protection based integrated circuit (IC) camouflaging strategy, an efficient attack technique for its circuit structure defects was proposed, and its improvements were analyzed. Firstly, the implementation methods for the minterm protection based camouflaging strategy proposed by CamoPerturb were analyzed, and the mechanism of the minterm perturbation induced by the gate replacement was demonstrated by leveraging sensitization and implication principles. Then, the replaced gate and the perturbed minterm were calculated by using FAN algorithm as a reference, thus recovering the original circuit structure. The experimental results in ISCAS'89 benchmark circuits and the controllers of OpenSPARC microprocessor, show that the CamoPerturb circuit can be decamouflaged in a few milliseconds by using the proposed method.