ADobf: Obfuscated Detection Method against Analog Trojans on I2C Master-Slave Interface

Hardware Trojan war is expanding from digital world to analog domain. Although hardware Trojans in digital integrated circuits have been extensively investigated, there still lacks study on the Trojans crossing the boundary between digital and analog worlds. This work uses Inter-integrated Circuit (I
²
C) as an example to demonstrate the potential security threats on its master-slave interface. Furthermore, an obfuscated Trojan detection method is proposed to monitor the abnormal behaviors induced by analog Trojans on the I
²
C interface. Experimental results confirm that the proposed method has a high sensitivity to the compromised clock signal and can mitigate the clock mute attack with a success rate of over 98%.