A Color Image Encryption Algorithm with Cat Map and Chaos Map Embedded

Li Guodong; Han Xuejuan

摘要

In order to deal with the problem of encryption algorithms being overly simplistic, and the relatively low security of color images that creates potential to be attacked in the transmission process, this paper will introduce a new encryption algorithm that is designed to divide color images into R, G and B layers. In the scrambling operation: the first scrambling is aimed to block the clear text image scrambling; The second scrambling is the dynamic Arnold scrambling of the ciphertext after the first scrambling. In the diffusion operation, the scrambled ciphertext image was taken as the input, and the pseudo-random sequence generated by Tent mapping and Sine mapping was embedded. The sequence generated by Logistic mapping was used to select sub-blocks for block diffusion of the image. Tent-Sine mapping was applied to the second diffusion to obtain the final ciphertext image. The algorithm designed in this paper combines image block scrambling and dynamic Arnold scrambling, the scrambling degree of each layer of image pixels would be greatly improved, thus improving the security of color images. In the process of diffusion, chaos sequence is selected for diffusion operation, which increases the difficulty of decoding ciphertext. The simulation results show that the new algorithm has desirable encryption effect, strong key sensitivity and large key space, and complex encryption algorithm can effectively resist attacks, which certainly has value in image information security.

机译：为了处理加密算法的问题过于简单，以及在传输过程中产生攻击攻击的彩色图像的相对低的安全性，本文将引入一种新的加密算法，旨在将彩色图像划分为r ，g和b层。在加扰作业中：第一个争抢旨在阻止清晰的文本图像加扰;第二次争抢是第一次加扰后密封的动态arnold争抢。在扩散操作中，将加扰的密文图像作为输入，嵌入由帐篷映射和正弦映射产生的伪随机序列。逻辑映射生成的序列用于选择图像的块扩散的子块。将帐篷正弦映射应用于第二扩散以获得最终的密文图像。本文设计的算法结合了图像块加扰和动态arnold加扰，将大大提高每层图像像素的加扰度，从而提高了彩色图像的安全性。在扩散过程中，选择混沌序列用于扩散操作，这增加了解码密码的难度。仿真结果表明，新算法具有所需的加密效果，强键灵敏度和大关键空间，复杂的加密算法可以有效地抵抗图像信息安全性的攻击肯定存在值。

A Color Image Encryption Algorithm with Cat Map and Chaos Map Embedded

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