A fixed-value mask algorithm for SMS4 was proposed in order to resist power analysis attack based SMS4.Firstly

an atomic mask algorithm of SMS4 was designed to resist against high-order power analysis attack based on the study of the structure of SMS4 algorithm

the intermediate variables were masked in the method.Secondly

pseudo-random fixed-value mask method（PFM） was proposed based on the above method

when its hardware implementation aiming at low power and less areas was considered about.Moreover

PFM has the ability to resist against high-order power analysis attacks when applied to the sensor node of special environment of communication.Finally

the experimental results show that the proposed algorithm has the ability to effectively resist second high-order differential power analysis attack without increasing much power and hardware resources.