关键词: 硬件木马, 木马插入, 硬件安全, 路径延时检测

Abstract: According to the hardware Trojans inserted during design and fabrication, the authors provide a new model of Trojan. New model is based on a finite state machine which is more difficult to trigger and detect than those based on combinational circuits. Also, the locations in target circuits to insert Trojans are considered to avoid being detected using path delay fingerprint method. S349 circuit from ISCAS’89 benchmark circuits is chosen as the target circuit. Functional simulations are performed and delay information is simulated. The results show that this type of hardware Trojan is difficult to activate and the insertion method is effective to hide delay information.

Key words: hardware Trojan, Trojan insertion, hardware security, path delay detection