基于两个离散混沌动力系统的序列密码算法  

A stream cipher algorithm based on two discrete chaotic dynamical systems

作　　者：王丽燕[1] 许佳佳[1] 李海燕[2] 

机构地区：[1]大连大学信息工程学院,辽宁大连116622 [2]辽宁科技大学理学院,辽宁鞍山114051

出　　处：《大连理工大学学报》2014年第5期581-588,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(71072161)

摘　　要：基于两个离散混沌动力系统提出了一种新的序列密码算法.该算法用分段非线性映射的上一次迭代的输出作为分段非线性映射的下一次迭代的输入,并将迭代序列通过离散化算子转化为0-1序列,由0-1序列来选择两个混沌动力系统中的分段非线性映射.对算法进行了仿真实验和安全性分析,并对该映射产生的序列的随机性、初始值敏感性及其他性质进行了研究.研究结果表明,算法呈现出密钥、明文与密文之间高度的敏感性,密文和明文之间的相关度极小等特点,从而起到有效防止密文对密钥和明文信息泄露的作用.A new stream cipher algorithm is designed based on two discrete chaotic dynamical systems.The algorithm uses the front output of the piecewise nonlinear map as the next input of the piecewise nonlinear map,and the iterative sequences are transformed into 0-1 sequence with discrete operator,and then,the 0-1 sequence is used to select the piecewise nonlinear maps of the two chaotic dynamical systems.The simulation test and security analysis are conducted to study the randomness, the initial value sensitivity and other properties of sequences generated by the map.The experimental results show that the algorithm has the characteristics of the high sensitivity of secret key,plaintext and ciphertext,and the small correlation between ciphertext and plaintext.These peculiarities can efficiently prevent ciphertext to leak the information of secret key and plaintext.

关 键 词：混沌动力系统 分段非线性映射 序列密码 

分 类 号：TN918[电子电信—通信与信息系统]