基于优化协调复合混沌密码系统的广域海量信息加密方法

An Encryption Method for Wide-area Massive Information Based on Optimal Coordinated Composite Chaotic Cryptosystem

为了提高智能电网广域海量信息传输和存储的安全性,满足电力系统重要信息的实时保密通信要求,提出了一种基于优化协调复合混沌密码系统的电力信息加密方法。利用2个一维混沌系统良好的初值敏感性、伪随机性、非周期性来构造复合混沌密码系统,在小波变换空间对明文信息的小波系数进行复合混沌加密。基于Shannon密码学理论,选取相关系数和均匀度指标来构建综合目标函数,采用自适应混沌免疫粒子群优化算法,对复合混沌密码系统的控制参数进行协调优化整定,以增强混沌运动子系统之间的协调能力,改善复合混沌系统的加密性能。对比加密实验、统计特性分析以及敏感性测试结果均表明提出的加密方法是可行有效的。

In order to enhance the security and meet the real-time confidential communication requirement of important power information in smart grid,a novel power information encryption method is proposed based on optimal coordinated composite chaotic cryptosystem.The composite chaotic system is constructed using two one-dimensional chaotic systems with good initial value sensitivity,good pseudo randomness and aperiodicity.The wavelet coefficients of plaintext are encrypted by using composite chaotic block sequences in wavelet transform domain.According to Shannon’s cipher theory,correlation coefficient and uniformity indices are selected to form the comprehensive objective function.A new adaptive chaotic immune particle swarm optimization algorithm based on the idea of chaos optimization and artificial immune is presented and applied to design optimal coordinated parameters of the composite chaotic system,which can strengthen the coordination between chaotic motion systems and improve the encryption performance of the composite chaotic system.Comparative encryption experiments,statistical analysis and sensitivity test results show that the proposed encryption method is feasible and effective.