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The new idea to enhance the concealment is proposed. By intentionally age the embedded hardware Trojan gate and reduce its leakage power to the greatest extent, the external variation caused by the hardware Trojan is hidden in the presence of parameter variation V_th. Furthermore, it would be difficult to detect via leakage power measurements. By increasing V_th from 20% to 80% in Hspice, the decrement of leakage power increases relatively and the validity of the proposed idea is validated.