A side channel energy attack method for linear transformation output of sm4 cipher

Abstract

The invention discloses a side channel energy analysis attack method aimed at the linear transformation output of the SM4 cryptographic algorithm, comprising the following steps: S1: selecting the bytes for two attacks, each corresponding input is (Xi+1⊕Xi+2⊕ Xi+3) The byte corresponding to the byte to be attacked is a random number, and the others are fixed numbers. Use the side channel energy attack method to attack the byte of the wheel key and the corresponding fixed number in the linear transformation. The round key bytes and fixed numbers of the second attack can be calculated accordingly to obtain the complete wheel key rki, where i=0,1,2,3; S2: According to the first four rounds of the wheel key rk0, rk1, rk2, and rk3 reversely calculate the initial key through the key expansion algorithm. Using the above analysis method not only realizes the side channel energy analysis attack on SM4 linear transformation output, but also reduces the number of attacks required to attack the complete key, and enhances the attack efficiency and success rate.

Description

technical field [0001] The invention relates to the field of cryptographic algorithm analysis and detection, in particular to a method for side channel energy attack aimed at the linear transformation output of the SM4 cryptographic algorithm. Background technique [0002] With the development of information and analysis circuit technology, the cracking of hardware cryptographic electronic equipment no longer simply stays on the protocol and algorithm, but starts with the information leaked in the process of processing data. In the process of processing information, hardware cryptographic electronic equipment leaks information such as energy, electromagnetics, errors, and time. Using these leaked information to attack cryptographic electronic equipment is the so-called Side Channel Attacks (Side Channel Attacks). It can be divided into energy analysis attack, electromagnetic attack and error attack, etc. Among them, energy analysis attack is more efficient and becomes the ma...

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Problems solved by technology

[0070] The purpose of the present invention is to provide a side channel energy attack method aimed at the linear transformation output of the SM4 cryptographic algorithm, to solve the diffusion effect of the linear transformation on the key, resulting in the inability to use the linear transformation output as the attack intermediate data to directly attack the wheel key

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