Under a simple power leakage model based on Hamming weight,we find some operation in SMS4 algorithm will leaks information about secret key which is vulnerable to differential Power Analysis attack.

• 在基于汉明重量的简单能量泄露模型下,我们发现SMS4算法中某些操作会泄露出密钥信息,从而容易受到差分能量分析攻击。