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为解决电磁分析攻击中近场信号获取的距离局限性及均值差分信号分析方法不够精确的问题,提出一种针对微控制器密码芯片的远场电磁分析攻击方案.利用小型宽带电磁信号接收机接收远场电磁信号,并采用相关性统计方法进行数据分析.针对微控制器中运行的高级加密标准(AES)密码算法攻击实验表明,当电磁接收机调谐为微控制器晶振频率的13倍频时,通过AM调制解调方式在距微控制器0.5 m处可以获得最大相关系数为0.221的较强电磁信号.针对远场电磁信号信噪比较低的特性,采用改进的最小样本量估计方法,利用8 047个电磁轨迹样本成功获取了AES的秘密密钥.
In order to solve the problem of the distance limitation of near-field signal acquisition and the method of inaccurate average signal analysis in electromagnetic analysis attack, a far-field electromagnetic analysis attack scheme for micro-controller cryptographic chip is proposed. Far-field electromagnetic signals, and analyzed the data by correlation statistics method.Experimental experiments on the advanced encryption standard (AES) cryptography algorithm running in the micro-controller show that when the electromagnetic receiver is tuned to 13 times the frequency of the crystal oscillator of the microcontroller , A strong electromagnetic signal with maximum correlation coefficient of 0.221 can be obtained by AM modulation and demodulation at a distance of 0.5 m from the microcontroller.Aiming at the low signal-to-noise ratio of the far-field electromagnetic signal, an improved minimum sample size estimation method is adopted, The AES secret key was successfully obtained using 8 047 electromagnetic track samples.