关键词: 硬件木马, 关键路径, 关键节点, 监测器

Abstract:

With the rapid development of the semiconductor industry, hardware Trojans have brought huge hidden dangers to the reliability and security of integrated circuits. Existing research shows that the critical path of the circuit is more vulnerable to hardware Trojan attacks. A real-time monitoring scheme for preventing hardware Trojan insertion is proposed for the critical path of the circuit. The delay of each path of the circuit is calculated according to the topological logic sequence of the circuit, and the path with the largest delay of the circuit is selected as the critical path of the circuit. The conversion probability of all nodes on the critical path is calculated. The nodes below the specific threshold on the critical path are selected to use the monitor design. Compared with the logic test method that only detects the main output of the circuit, fully consideration is given for the activation of the hardware Trojan on the critical path doesn’t change the main output. The experimental results show that the scheme can effectively prevent and monitor the insertion of hardware Trojans in the critical path of the circuit with an increase of 24.32% area overhead for the most.

Key words: hardware Trojans, critical path, critical node, monitor