With the popularization and application of the AES algorithm, in resource limited embedded devices, such as smart card, how to effectively resist power analysis attacks, and improve the security of cryptographic chip, this topic has aroused broad attention of more and more scholars. Aiming at this problem, this paper put forward an improved defense method that based on the fixed value masking scheme. The method need to add another group of mask values on the basis of the simple fixed mask method, in order to use different values to mask each row of the state matrix. In this way we can reduce the possibility of the occurrence of mask values may offset each other circumstances and exposure the intermediate values during the MixColumns operations. Through building a power analysis platform for experimental analysis, compared with other defense methods, results show that:the improved defense method has a higher security. It is able to resist second-order DPA attacks.%随着AES算法的推广应用,在资源受限的智能卡等嵌入式设备中,如何有效抵抗能量分析攻击,提高密码芯片的安全性,这一课题已引起了越来越多学者们的广泛关注. 本文针对该问题,提出了一种改进的固定值掩码防御方法.该方法在简单固定值掩码方法的基础上,增加另一组掩码值,在列混淆的过程中随机调用实现对状态矩阵的分行掩码,从而减小列混淆操作可能导致的掩码相互抵消,暴露中间值的可能性. 通过搭建能量分析平台进行实验分析,并与其他防御方法相比较分析,结果表明改进后的防御方法安全性更高,能够抵抗二阶差分能量分析攻击.
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