The PCB supply chain has become globally distributed such that PCBs are vulnerable to hardware Trojan attacks. Moreover, attacks on PCBs are possible even after a system is deployed. Various countermeasures have been proposed and efforts to develop board-level Trojan benchmarks are underway, but IC Trojan taxonomies do not capture important characteristics of PCB implants. This work surveys existing PCB countermeasures and examples of board-level Trojans to inform a new taxonomy suited for PCB Trojans. Our taxonomy reflects practically significant characteristics of board-level Trojans to guide development of board-level countermeasures and fair, comprehensive benchmark suites.

PCB供应链已遍布全球，因此PCB容易受到硬件Trojan攻击。此外，即使在部署系统之后，也可能对PCB进行攻击。已经提出了各种对策，并且正在努力开发板级Trojan基准，但是IC Trojan分类法并未捕获PCB植入物的重要特征。这项工作调查了现有的PCB对策和板级木马示例，以告知适用于PCB木马的新分类法。我们的分类法反映了板级木马的实际重要特征，以指导板级对策和公平，全面的基准套件的开发。