微控制器密码芯片秩相关电磁分析  

Rank correlation electromagnetic analysis on microcontroller

作　　者：李雄伟[1] 张鹏[1] 陈开颜[1] 赵强[1] 

机构地区：[1]军械工程学院计算机工程系,石家庄050003

出　　处：《深圳大学学报（理工版）》2012年第3期230-235,共6页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(60940019;60571037)~~

摘　　要：研制一种新的基于秩相关系数的电磁分析技术.利用Spearman秩相关系数,度量密码芯片的电磁辐射信号与内部处理数据之间的相关性.与基于Pearson线性相关系数的方法相比,该方法对测试数据的样本分布不作要求,对测量水平要求更低,具有更强的适应性.针对AT89C52微控制器实现的AES密码进行的攻击实验表明,当电磁探头距离微控制器10 cm时,基于Pearson相关度量的攻击失效,而基于秩相关度量的电磁分析技术仍能在42 500个样本下成功获取AES前8位密钥.A new electromagnetic analysis （EMA） technique based on rank correlation coefficient was proposed. The correlation between the electromagnetic signal and the data operated in the cipher chip was measured with Spearman＇s rank correlation coefficient. Compared to the method of Pearson linear correlation coefficient, the rank correlation method did not need particular distributed sample data and did not need high-resolution measuring tools. There for, it was more adaptable. Experiments were executed on the prototype of AES, which implemented in an AT89C52 microcontroller. The results show that Pearson＇s correlation based EMA failed when the electromagnetic probe positioned 10 cm away from the chip, while Spearman＇s rank correlation coefficient based EMA successfully retrieved the first 8-bit secret key of AES with 42 500 traces.

关 键 词：数据安全与计算机安全 旁路攻击 电磁分析 秩相关性 微控制器 高级加密标准 

分 类 号：TN918[电子电信—通信与信息系统] TP309[电子电信—信息与通信工程]