一种基于混沌序列的加密算法设计

加密是保证敏感信息安全的重要手段。该文设计了一种基于混沌序列的加密方法。该方法以非线性动力系统的Logistic映射为模型,采用线性同余法生成序列参与融合扰动,解决混沌有限精度问题。加密算法中,引入明文长度作为控制参数,控制混沌及线性同余的初始循环次数,使密钥流与要加密的明文相关,增加密钥流的复杂性和随机性,抵御混沌重构攻击,进一步增加安全性。实验结果表明,该算法能够得到令人满意的效果。

Design of a Encryption Algorithm based on Chaotic Sequence

Cryptography algorithm is an effective approach to assure security for sensitive information. An encryption method based on the chaotic sequence has been designed in this paper. The method takes the Logistic map of nonlinear dynamical systems as chaos model. Sequence generated by linear congruence method is used for mapping chaotic sequence to the integer space so as to solve the finite precision problem of chaos. Length of the plaintext is introduced as a controlling parameter in the algorithm. The parameter is used to control initial cycle times of the chaos and linear congruence, make the key stream related to plaintext, increase complexity and randomness of key stream, improves the ability of resisting attack by chaos reconstruction, and further increasing security. The experiment results indicated that the proposed algorithm can obtain satisfactory encryption effect.