【摘要】 该文利用三种不同的混沌映射构建一种随机步长混沌映射。该映射不仅保持了原有的混沌映射的各种特性,而且具有新的优点。映射产生的密码流能对各种类型的文件进行加密和解密处理,由此形成的保密系统能抵抗最强力的选择性密文攻击。系统已经实现。理论和实践表明,该系统具有很好的安全性和实用性。更多还原

【Abstract】 This paper discusses a new chaotic dynamical system which is random steps chaotic dynamical system.This system consists of three different kinds of normal chaotic dynamical systems.It uses one normal chaotic system to generate chaotic mapping,the iterative steps are predetermined by the other two normal chaotic systems.The mapping not only keeps up many properties of normal chaotic mappings,one of which is that the trajectory of chaotic mapping is sensitive to initial conditions and seems to be random,but also has many new advantages which normal chaotic mappings have not.One of the new advantages is that iterative steps are random,so the mapping presents more complexity than normal chaotic mapping and the trajectory of the mapping is more difficult to trace.Because of the sensitivity and randomicity of the trajectory,the chaotic mapping can be used to produce stream cipher that can encrypt and decrypt all kinds of multi-format images and files.Based on the chaotic mapping,a new secret system can be set up.After analyzing with theories and practice,the secret system is proved to be secure,quick and utilizable.更多还原