Recently, the issue of malicious circuit alteration and attack draws more attention than ever before due to the globalization of IC design and manufacturing. Malicious circuits, also known as hardware Trojans, are found able to degrade the circuit performance or even leak confidential information, and accordingly it is definitely an issue of immediate concern to develop detection techniques against hardware Trojans. This paper presents a ring oscillator-based detection technique to improve the hardware Trojan detection performance. A circuit under test is divided into a great number of blocks, path assignment is optimized using a path tracking algorithm, and a high coverage is reached accordingly.

近年来，由于IC设计和制造的全球化，恶意电路更改和攻击问题比以往任何时候都更加受到关注。恶意电路又称硬件木马，会降低电路性能，甚至泄露机密信息，因此开发针对硬件木马的检测技术绝对是当务之急。本文提出了一种基于环形振荡器的检测技术，以提高硬件木马检测性能。将待测电路划分为大量块，通过路径跟踪算法优化路径分配，从而达到高覆盖率。