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研究了可变随机S盒对分组密码安全性的意义,给出了一种新的使用可变随机S盒的随机化分组密码算法,并在此基础上提出了相应的加密方案:在分组密码算法中,保持算法结构不变,将S盒作为变量,利用可变的S盒来抵御密码分析.随后给出安全性评估,证明该方案提高了分组密码抵抗目前已知攻击的能力.最后从S盒的生成方式与算法结构两方面讨论了改进策略.
This paper studies the significance of variable random S-boxes to the security of block ciphers, and presents a new randomized block cipher algorithm using variable random S-boxes. Based on this, a corresponding encryption scheme is proposed: In the algorithm, the structure of the algorithm is kept unchanged, the S-box is used as a variable, the variable S box is used to resist the cryptanalysis, and then the security assessment is given to prove that the scheme improves the ability of block cipher to resist the currently known attacks. S-box generation method and algorithm structure are discussed in two aspects to improve the strategy.