基于RC4的混沌改进算法及其性能分析

针对RC4算法所存在的不足和混沌序列的特点,提出了一种新的基于RC4的混沌改进加密算法.该算法把简单形式的Logistic混沌映射序列嵌入到RC4算法中,对RC4中PRGA阶段的S表中元素交换做出改进,并对改进后的算法性能进行了各种理论分析和实验检验.理论分析和实验结果表明,与原算法相比,扩展了原算法的密匙空间,有效地提高了算法的安全性以及抗攻击能力.新算法更利于保护无线局域网等领域的安全性和保密性,具有重要的工程应用意义.

An Algorithm Improved by Chaos Based on RC4 and Its Performance Analysis

In view of the shortcomings of RC4 algorithm and the characteristics of chaotic sequences, a new algorithm of chaos encryption improvements based on RC4 is proposed. The algorithm has embedded Logistic sequences, the simplest form of chaotic map sequences, into the RC4 algorithm, to make improvements in the exchange element on the RC4 PRGA stage in the S table, and having done a variety of theoretical analysis and experimental test to the improved performance of the algorithm. Theoretical analysis and experimental results show that, compared with the original algorithm, it has extending the original algorithm of key space, effectively improving the security of the algorithm and resistance to attack. The new method is more conducive to protecting the areas of wireless LAN security and confidentiality, and has important significance in engineering.