DPA resistance enhancement through a self-healing PLL based power mask

Attackers can benefit from different side-channel properties such as timing information, electromagnetic leaks and power consumption to achieve private key of a crypto-processor. Among side channel attacks, Differential Power Analysis (DPA) is widely used by hackers. In this paper a new approach is presented to make a system more immune to DPA. The proposed technique employs a low power Phase Locked Loop (PLL) to isolate supply voltage from crypto processor. The proposed method is implemented in 45nm CMOS technology.