摘要
本文构造了复合离散混沌动力系统 ,并研究了它不变分布和迭代轨迹的若干性质 .利用两个特殊的离散混沌系统 ,提出了基于复合离散混沌动力系统的序列密码体系 .由于复合离散混沌系统对初始条件的敏感性和迭代过程的伪随机性 ,本文提出的序列密码算法将明文和密钥序列完全融合在密文序列中 ,使它们与密文之间形成了复杂而敏感的非线性关系 ,这就防止了密文对有关信息的泄露 ,从而使系统具有很高的安全性 .该算法还拥有很大的密钥空间和均匀分布的密文 .
Although discrete chaotic systems is sensitive to initial conditions and its behavior seems to be random,it is not really stochastic process but determinate.It results in that chaos based encryption schemes are not good as we expect.In order to enhance the performance of the encryption algorithms based on discrete chaotic dynamical system,we present composite discrete chaotic dynamical systems and gives some results about its invariant distribution density and iteration sequence.We present a new approach to stream cipher utilizing a peculiar composite discrete chaotic dynamical system.Because of its sensitivity to initial conditions and randomness of the iteration sequence,the approach mingles secret keys with plaintext by iterating the chaotic system to produce ciphertext.Therefor they hold very complex and sensitive nonlinear relations.It prevents ciphertext to leak the information of plaintext and secret key and makes the security of the algorithm independent of the complexity of the ciphertext.The algorithm is provided with larger secret space and uniform distributing ciphertext.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2003年第8期1209-1212,共4页
Acta Electronica Sinica
基金
中科院王宽诚博士后工作奖励基金
信息安全国家重点实验室开放课题
关键词
混沌
动力系统
序列密码
chaos
dynamical system
stream cipher
