Side channel energy attack method aiming at SM4 password linear transformation output

Abstract

The invention discloses a side channel energy attack method aiming at SM4 password linear transformation output. The method includes the following steps: S1 selecting bytes to be attacked twice, wherein the corresponding digits input each time are bytes in (Xi+1 Xi+2 Xi+3), the bytes corresponding to the bytes to be attacked are random digits, and others are fixed digits, adopting the side channel energy attack method to first attack bytes of a round key and the fixed digits in linear transformation, conducting corresponding computing on the bytes and the fixed digits of the round key obtained through the two-time attack to obtain the complete round key rki, wherein i= 0, 1, 2, 3; S2 conducting reversible calculation to obtain an initial key through a key expansion algorithm according to rk0, rk1, rk2 and rk3 of first four rounds of the round keys. By means of the analysis method, side channel energy analysis attack aiming at SM4 linear transformation output is achieved, attack times required by attack of the complete key are reduced, and attack efficiency and success rate are improved.

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...

AI Technical Summary

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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