基于Logistic和Baker映射的视频加密方法  

Video Encryption Method Based on Logistic and Baker Mapping

作　　者：于志宏[1] 王静波[1] 刘喆[2] 周栩[1] 李江春[1] 于哲舟[1] 

机构地区：[1]吉林大学计算机科学与技术学院,长春130012 [2]吉林省经济管理干部学院会计系,长春130012

出　　处：《吉林大学学报（信息科学版）》2008年第3期253-258,共6页Journal of Jilin University（Information Science Edition）

摘　　要：为保证网络信息传输的安全性,提出一种视频图像加密方法。该方法引入混沌系统中的Logistic映射和Baker映射,结合H.264视频压缩编码特点,利用Baker映射对DCT(Discrete Cosine Transform)变换量化后的块进行位置置乱,改变空间像素的位置;利用Logistic映射产生的伪随机序列生成密码序列,对块矩阵像素的数值进行改变;在熵编码完成后,利用Logistic映射产生的伪随机序列,对0,1二进制串进行漂移的流加密。该算法的计算复杂度低,具有良好的安全性和实时性,对编码压缩性能影响较小。In order to protect security for the transmission of networking infornation,a video image encryption method based on the video image compression and cryptography technology is presented.The method introduces Logistic mapping and Baker mapping of the chaotic system,combining the features of H.264 video coding,and utilizes Braker mapping to scramble for positions of the block of DCT（Discrete Cosine Transform）-quantifiable and change the location of space pixel.Then the password sequence is qenerated through pseudo-random sequence produced by Logistic mapping,and changing numerical value of block matrix pixel.Finally after finishing entropy coding,using pseudo-random sequence produced by Logistic mapping takes drifting stream encryption to 0,1 binary strings.The arithmetic has low computing complexity,good safety and real-time,smaller impact on performance of encoding compression.

关 键 词：BAKER映射 视频 加密技术 LOGISTIC映射 

分 类 号：TN918[电子电信—通信与信息系统]