Fig. 6
From: A security method of hardware Trojan detection using path tracking algorithm
a Mode 1 Trojan path, b Mode 2 Trojan path, c Mode 3 Trojan path, d Type 2 detection cases. Based on the original detection circuit, Trojan detections are classified into two types according to the added path configuration. A path is on a single route in Type 1, while a path is across multiple routes in Type 2. Path is on a single route, and Type 1 is further categorized into three modes