Value-at-risk quantitative method about password chip under differential power analysis attacks

Abstract

Based on the principle and characteristics of the Differential Power Analysis(DPA) attack,the kernel function was used to estimate the probability distribution density of the leakage of power consumption in the password chip work process.By calculating the mutual information between the attack model and the power leakage,when the guessed key was correct,this paper quantified the risk value of the password chip in the face of DPA attacks.The experiments show that the risk quantification method can be a good estimate of the correlation degree between the attack model and power leakage when the guessed key is correct and then provides important indicators to complete password chip risk evaluation.