一种反馈-前馈结构的混沌流密码

提出了一种用一维分段线性映射迭代所产生的混沌序列驱动一维无限折叠映射所构成的反馈－前馈结构的混沌流密码体制。该密码体制借助于一维无限折叠映射所具有的无限混叠性质，将一维分段线性映射所产生的相空间分布简单的驱动序列，变换为在相空间上接近于均匀分布、序列相邻元素接近于统计独立的密钥序列，驱动序列和密钥序列间的依赖关系异常复杂且两者接近于统计独立。与传统的多次复合映射方法和量化方法相比，该密码体制具有构造简单、实现效率高的优点。

Chaotic Stream Cipher with Feedback-Forefeed Structure

One stream cipher scheme with feedback-forefeed structure is presented by using the chaotic sequences generated by a one-dimensional piecewise linear map to drive a one-dimensional map with infinite collapses. By means of the infinite-collapse property of the one-dimensional chaotic map with infinite collapses, the scheme transforms the driving sequences with the simple distribution in phase space generated by the one-dimensional piecewise linear map into the key sequences with nearly uniform distribution in phase space. The adjacent elements of the key sequences are nearly statistically independent. The driving sequences and the key sequences have very complicated relationship and are nearly statistically independent. The scheme has simpler structure and higher efficiency than the traditional ones based on multi-compound and quantification .