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为了提高旁路模板分析密钥恢复攻击的效率,提出一种自适应选择明文旁路模板分析方法.该方法选择密码算法中密钥参与的异或操作为攻击点,以两个操作数的汉明距离构建旁路信号模板,从二进制位为全“1”的明文开始,按选择明文与密钥的汉明距离不断减小的方向每次改变选择明文得到一个比特位,将选择明文逐步逼近并最终恢复密钥.针对微控制器AT89C52)上实现的高级加密标准密码算法攻击实验表明该方法可在不增加攻击所需样本的条件下提高攻击效率.
In order to improve the efficiency of the bypass template to analyze the key recovery attack, this paper proposes a self-adaptive plaintext bypass template analysis method which chooses the exclusive OR operation of the key in the cryptographic algorithm as the attack point, The distance from the signal template to build bypass, from the binary bit to the full “1 ” plaintext, according to the choice of plaintext and key Hamming distance decreasing the direction of each change to select plaintext to get a bit, the choice of plaintext Gradually approaching and finally recovering the key.According to the advanced encryption standard cipher algorithm attack experiment on microcontroller AT89C52), experiments show that this method can improve the attack efficiency without increasing the sample required by the attack.