参数可变的多混沌映射加密系统

Multiple Chaotic Maps Encryption System

利用混沌映射具有对初值和系统参数的敏感性以及轨道的不确定性,提出一种基于多个一维混沌映射的加密算法。该加密算法使用线性同余随机数发生器产生混沌映射的系统参数和3个一维混沌映射的使用顺序,同时通过输出反馈方式动态改变混沌映射初值、迭代次数以及线性同余随机数发生器参数。实验结果和安全性分析表明,该算法密钥空间大,具有对明文和密钥的敏感性,能有效抵抗选择明文等穷举攻击和统计分析攻击。

A new cryptosystem based on multiple one-dimensional chaotic maps is proposed by utilizing the properties of chaotic map such as sensitivity to initial conditions and system parameters, and orbit uncertainty. The system parameters of chaotic maps and the using order of three one-dimensional maps are generated by using linear congruent generators. The initial value and iterative number of chaotic map and linear congruence generator （LCG） parameters are dynamically changed by output feedback. Simulation results and security analyses show that the proposed cryptosystem has large key space and high sensitivity to key and plaintext, and can resist the brute attack and statistical attack.