一种针对分组密码S盒的组合侧信道攻击方法*

近年来随着半导体工艺的飞速发展和信息安全的重要性不断增强，越来越多的硬件嵌入了密码算法以保证数据安全性。针对嵌入了FPGA密码芯片的设备在运行算法时泄漏的侧信道信息进行了研究，提出一种改进分组密码S盒的组合侧信道攻击方案，该方案由差分功耗攻击、模板攻击、和毛刺攻击构成。通过传统的差分功耗攻击确定S盒运行的时间区间，然后针对目标S盒的输入输出利用一个时钟周期内逻辑门毛刺个数与部分功耗线性相关的方法，采用线性模型匹配算法恢复密钥并减少了基于多元高斯模型匹配的计算量，为今后提高侧信道攻击的效率提供依据。

An combinational side-channel attack on S-box in block cipher

With the high speed development of semiconductor technology and the strengthed importance of information security,more and more hardware embedded with cryptographic algorithm to protect security of data. Aiming at side-channel information leaked by the cryptoequipment embedded with a FPGA cryptographic chip ,here come up with an improved combinational side-channel attack of a block cipher consisting of DPA,template attacks and glitches attacks in S-box.After being sure of time period of S-box by DPA,it recovered the key through a matching algorithm of linear model to reduce the calculated amount of a matching algorithm of multivariate Gaussian in terms of the existing linear correlation between the number of glitches and a part of power,and it will give evidence to improve the efficiency of side-channel attacks.