Side channel energy attack method aiming at SM4 password round function output

Abstract

The invention discloses a side channel energy attack method selecting a clear text or a cipher text aiming at SM4 password round function output. The method includes the following steps: S1 selecting clear text input or cipher text input to enable one byte of (Xi+1 Xi+2 Xi+3) to be a random digit and other bytes to be identical fixed digits, adopting the side channel energy attack method to first attack bytes of a round key and the fixed digits in linear transformation and then attack other fixed digits in linear transformation, conducting corresponding computing on attacked data to obtain the complete round key rki, wherein i= 0, 1, 2, 3; S2 conducting reversible calculation to obtain an initial key through a password expansion algorithm according to rk0, rk1, rk2 and rk3 of first four rounds of the round keys. By means of the analysis method, the collection curve attack times and the clear text selection times can be reduced, and analysis flexibility, attack efficiency and successfully rate are improved.

Description

Technical field [0001] The present invention relates to the field of cipher algorithm analysis and detection, in particular to a method for selecting plaintext or ciphertext side channel energy analysis attack for SM4 cipher algorithm round function output. Background technique [0002] With the development of information and analysis circuit technology, the cracking of hardware cryptographic electronic devices no longer simply stays on the protocol and algorithm, but uses the information leaked in the process of data processing to crack. In the information processing engineering of hardware cryptographic electronic devices, there are leakage of information such as energy, electromagnetics, errors, and time. Using this leaked information to attack cryptographic electronic devices is the so-called side channel attacks (Side Channel Attacks). It can be divided into energy analysis attacks, electromagnetic attacks and error attacks, among which energy analysis attacks have become th...

AI Technical Summary

Problems solved by technology

[0070] The purpose of the present invention is to provide a kind of new method for the selected plaintext or ciphertext side channel energy attack of SM4 cipher algorithm round function output, to solve the existing selection plaintext or ciphertext side channel energy attack for SM4 cipher algorithm round function output , the need to select plaintext, the number of acquisition curves and the number of curves are large, etc. This method not only realizes the side-channel energy attack on the selected plaintext or ciphertext output of the SM4 cryptographic algorithm round function, but also enhances the efficiency of attack analysis , flexibility and effectiveness

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