针对分组密码的攻击方法研究

Research on Attacks Method for Block Ciphers

为提升旁路攻击对分组密码算法硬件实现电路的攻击效果,增大正确密钥与错误密钥间的区分度,提出一种针对分组密码的旁路攻击方法。结合差分功耗分析(DPA)攻击和零值攻击的特点,通过分类来利用尽可能多的功耗分量,以攻击出全部密钥。在FPGA上实现AES硬件电路并进行实验,结果表明,在20万条全随机明文曲线中,该方法恢复出了全部密钥,相比DPA攻击方法,其正确密钥与错误密钥间的区分度更大。

In order to improve the effect of Side Channel Attacks(SCAs)on the hardware implementation of block cipher algorithm,and increase the discrimination between correct keys and wrong keys,this paper proposes a SCAs method for block ciphers.This method combines the characteristics of Differential Power Analysis(DPA)attack and zero-value attack,and utilizes as many power components as possible through classification,thus obtaining all keys by attacking.Then,the AES hardware circuit is implemented on the FPGA and experiments are carried out.The results show that the proposed method successfully recovers all keys in 200,000 full random plaintext curves.Besides,the correct keys and wrong keys are more distinguishable in this method than those in the DPA attack method.