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混沌系统具有良好的伪随机性、混频特性、对初始状态的敏感性和复杂的映射参数等特性,这些特性与密码学要求的产生伪随机信号、混乱和扩散、加、解密密钥的难以预测等属性是十分吻合的。近些年来,不少学者提出了多种基于混沌理论的密码算法,但对其安全性并没有详尽的分析。针对一种较新的基于Feistel结构的混沌分组密码,应用不可能差分的分析方法,在固定S盒的情况下对其安全性进行了分析,并在动态S盒的情况下说明了其安全性所在。
Chaotic system has the characteristics of good pseudo-randomness, mixing characteristics, sensitivity to initial state and complicated mapping parameters, which are different from the requirements of cryptography in generating pseudo-random signals, chaos and spread, difficulty in adding and decrypting keys Forecasting and other attributes are very consistent. In recent years, many scholars have proposed a variety of cryptographic algorithms based on chaos theory, but have not analyzed their security completely. Aiming at a newer chaotic block cipher based on Feistel structure, this paper analyzes the security of a fixed S-box by applying the analysis method which can not be differentiated, and illustrates its security in the case of a dynamic S-box Where you are.