一种改进的基于多混沌映射的流加密算法

An improved multi-chaotic maps based stream cipher algorithm

为了提高计算精度受限情况下单混沌映射流加密系统的安全性,改善输出密钥流序列的性能,采用多混沌加密思想,对多种不同单混沌映射进行合理组合.提出一种改进的基于多混沌映射的流加密算法,使产生的密钥流序列具有更高的安全性,并且通过FIPS140-2标准的随机性能测试.分析和仿真结果表明:与传统的基于单混沌控制的流加密算法相比,该算法扩展了初始密钥空间和流周期,产生的密钥流序列具有良好的随机性,提升了初始密钥包含特殊值时密钥流序列的性能.

Using the encryption idea of multi-chaos, this paper proposes an improved multi-chaotic maps based stream cipher algorithm through suitable combination of different single-chaotic maps to enhance the security of the single-chaotic stream encryption system and improve the quality of keystream sequence under precision limited condition. The output key-stream sequence is proved to be excellent by passing through the FIPS 140-2 standard randomness test. Compared with the conventional single-chaotic maps as well as their combination based stream cipher algorithm, the algorithm proposed in this paper enlarges the key space, extends the period, possesses excellent randomicity in key-stream sequence, and improves the quality of key-stream sequence under the special value in initial key condition.