Anti-differential fault attack security evaluation method and system suitable for block cipher algorithm infection protection

Abstract

The invention discloses an anti-differential fault attack security evaluation method and system suitable for block cipher algorithm infection protection. The method comprises the following steps: 1) calculating priori information of original ciphertext difference according to a block cipher algorithm, a fault injection target intermediate value and a fault model; 2) calculating the numerical valueof the information entropy in the infection protection to be evaluated; 3) calculating a numerical lower bound of information entropy in safety infection protection according to a block cipher algorithm, the fault injection target intermediate value and the fault model; and 4) judging the safety of the infection protection to be evaluated by comparing the relationship between the numerical valueof the information entropy in the infection protection to be evaluated and the lower bound of the numerical value. According to the method, the safety of infection protection is measured by information entropy, so that the evaluation process is independent of a specific key recovery strategy, and the evaluation result is more accurate. Meanwhile, according to the method, the infection function isseparated from the implementation of the block cipher of infection protection, so that the evaluation is universally applied to various different infection protections, and the evaluation efficiency is improved.

Description

technical field [0001] The invention relates to the field of information security block cipher analysis and protection, in particular to a method and system for evaluating the security of block cipher algorithm infection protection against differential fault attacks. Background technique [0002] Symmetric cryptography is a cryptographic system in which both communicating parties share the same secret key. Among them, the block cipher algorithm is a kind of widely used symmetric cipher. Common structures of block cipher algorithms include Feistel structure, SP structure, etc. The design of the cryptographic transformation function in the algorithm usually follows the security principle of confusion and diffusion, and through multiple rounds of iterative operations, it can resist all existing theoretical analysis methods, such as Differential analysis, linear analysis, integral attack and interpolation attack, etc. Among them, the S-box is a nonlinear obfuscation module wid...

AI Technical Summary

Problems solved by technology

Without changing the block cipher and fault injection scenarios, if you want to evaluate multiple infection protections using different infection functions, you need to start a new evaluation from scratch each time, so the evaluation efficiency is low

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