SM4 Chaotic Masking Scheme Against Power Analysis Based on FPGA

Abstract

SCA is one of the biggest threats to the security of encryption chip. It can crack the unprotected encryption chip at lower cost and faster speed, which weakens the security of the SM4 encryption algorithm circuit without any protection. In this paper, the SM4 encryption algorithm is implemented on FPGA. The pseudo-random sequence generated by discrete chaotic system is used to randomly mask the intermediate value in the SM4 encryption process. This will disrupt the power consumption in the encryption process, thus preventing power analysis. Experimental results show that the proposed chaotic mask scheme can effectively prevent intermediate value leakage and protect the SM4 encryption system from power analysis attack.