Abstract:

SM4 algorithm is the first open promulgated Chinese commercial block cipher algorithm. Since the algorithm is promulgated, some study on cryptanalysis of SM4 algorithm including side channel attack(SCA) by domestic and foreign scholars have been done. Recent literature study on SCA aremanily focus on power attack in time domain to compromise the secret password. But pure signal analysis in time domain has limitation. For instance, the alignment quality of power signal in time domain is the key factor to in fluence power analysis attack. In order to eliminate the effect of the signal alignment on the power analysis attack, the method of the power analysis attack against in frequency domain is proposed. The power analysis attack in frequency domain is not only feasible, but also can elimi nate the effect of the signal alignment. Finally, the method in this paper is successfully im plemented on the SM4 cryptographic in FPGA, in the case of no alignment operation in the frequency domain. The experimental results show that the proposed attack method is effec tive.

Key words: SM4 algorithm, power analysis attack, frequency domain, signal alignment