Global interconnection has allowed Integrated Circuit (IC) designers to greatly reduce costs by subcontract their manufacturing needs to external fabricators. However, there is a low cost fables semiconductor facilities have introduced a new potential for security viruses. Standardized testing and verification procedures cannot guarantee the circuit being tested is precisely the circuit that was designed. Thus, an adversary may insert malicious circuits known as hardware Trojans. Trojan trigger to observe either a faulty output or measurable uncommon on side-channel signals or disable functionality, reduce performance, leak hidden keys, insert a backdoor within the designed circuit.