基于与Tent Map拓扑共轭系统的混沌流加密方案设计  

Chaotic stream encryption scheme based on topological conjugate chaotic systems of Tent map

作　　者：田清[1] 徐正光[1] 田立[2] 

机构地区：[1]北京科技大学自动化学院,北京100083 [2]北京航空航天大学宇航学院,北京100191

出　　处：《工程科学学报》2015年第1期125-131,共7页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(60573058)

摘　　要：利用与Tent Map拓扑共轭的两类混沌系统,以及产生独立均匀分布密钥流的方法,设计了一种通用的流加密方案.此方案类似数字信封,但传递过程中不传输具体加密使用的密钥流,只传输随机产生的Tent Map初值以及两个系统的参数值作为系统密钥,产生两列独立同分布的密钥流对原始图像进行两次密文反馈异或加密.该方案达到初始值掩盖的目的,增加了截获者破译的难度.图像加密的实验结果显示该方案安全且有效.A general chaotic stream encryption scheme is proposed by using two chaotic systems which topologically conjugate with Tent map and a method to generate independent and identically distributed chaotic streams. The stream encryption scheme is similar to the digital envelop, but the difference is that we only transport the initial values of Tent map and the parameters of the two chaotic sys-tems as the initial key. According to the conjugate relation, the initial values of the chaotic systems are obtained to achieve the purpose of masking these initial values. We calculate two independent and identically distributed chaotic key streams based on the two chaotic systems to encrypt the plaintext through twice feedback XOR. An application result of image cryptograph illustrates that the stream en-cryption scheme is effective and secure.

关 键 词：图像通信 密码术 混沌系统 图像处理 拓扑 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]