Design of an RSA module against power analysis attacks

Power analysis attacks could be used to analyze the key information according to leakage information depending on the operation of cryptography algorithm and its hardware. They are highly effective with low cost. In this paper, an improved RSA algorithm against power analysis was proposed based on its basic theory. DPA attack for RSA specially, is discussed in details. In order to maximize the capability/cost, mask technique and removing intermediate value method are introduced into RSA system, which only cost more than 33.4% timing to realizing secure RSA algorithm, and its security was better greatly with a little cost, which would be meaningful for the security of a common crypto-system.