Abstract
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.
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