Run-time detection of hardware Trojans: The processor protection unit

Typical SOC designs use processors and therefore, trust in such processor cores is essential. The 2011 Embedded Systems Challenge (ESC 2011) [1] showed a wide range of possibilities to attack a processor through hardware Trojans. We propose an approach to detect suspicious behavior of a processor and thus assess if the processor is trustworthy or not. A countermeasure, called Processor Protection Unit (PPU) is presented focusing on its design to be particularly resilient against hardware Trojan insertion.