基于混沌的快速格雷码分段置乱视频加密算法

提出了一种基于混沌动力系统的按格雷码表顺序分块对视频图像进行数据置乱的完全加密方法。首先采用Chebyshev映射和Logistic映射相互迭代的方法产生混沌二值密钥,有效的克服了一维混沌动力系统中的平凡密钥和拟平凡密钥现象,并用此密钥对主要视频图像信息进行一次一密完全加密,然后利用格雷码序列的良好的空间遍历性和易生成性来对主要数据进行置乱,另外加密时保留了原数据的主体格式和大小。实验结果表明,算法安全性高,可有效抵抗已知明文攻击,速度快,加密后可播放,且可移植性良好。

Fast Gray code sequence subsection scrambling video encryption algorithm based on chaos system

An improved fast chaos based video complete-algorithm by using subsection scrambling method according to Gray code sequences was proposed.Firstly,a one-off L-bits binary key producing method which uses iterative mode be-tween logistic-map and chebyshev-map in order to overcome the bugs of the invalid-keys and the quasi invalid-keys ex-isting in one dimension chaotic dynamical system was adopted,and then the Gray code sequences which have good space-filling and easy generated characteristics were used to scramble key data in the video flow.At the same time,the same format and size were preserved in the encrypted files.Experimental results show that the proposed algorithm has high security and can effectively avoid the attack of the known plaintext,and it can work rapidly and be played normally.Its transplantable property is also good.