基于双延迟变形系统的图像加密方法  

Image Encryption Scheme Based on Double-Delay Reforming System

作　　者：蒲鑫[1,2] 王灵敏[1] 范晓丹[1] 白烨[2] 姜威[2] 郭丹伟[2] 

机构地区：[1]吉林大学电子科学与工程学院,长春130012 [2]长春理工大学光电信息学院,长春130012

出　　处：《吉林大学学报（信息科学版）》2014年第2期217-222,共6页Journal of Jilin University（Information Science Edition）

摘　　要：针对典型的超混沌序列伪随机性较差的问题,提出了一种基于掺铒光纤激光器双延迟变形系统超混沌序列的图像加密方法。该方法使用改进的双延迟变形系统产生超混沌伪随机序列,该序列有更大的李雅普诺夫指数,更强的伪随机特性。该方法应用在图像加密上,只需一轮置乱和扩散,并且不用同其他的伪随机序列联合使用。实验证明,该方法有可靠的安全性,足够的密钥空间和可接受的加密速度。To resolve the problem of typical characteristics of hyperchaos sequence with weak pseudo random,an algorithm based on double-delay reforming system is proposed.The sequence which produced by double-delay reforming system has larger Lyapunov exponent and better paseudo-random characteristics than that of the previous hyperchaos system.Without other combined pseudorandom sequences,only one total round of substitution and diffusion can meet good effect.Simulation result shows that the suggested algorithm satisfies the required performance tests such as high level security,large key space and acceptable encryption speed.

关 键 词：掺铒光纤激光器 双延迟变形系统 超混沌 图像加密 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]