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.

中文翻译：

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一种嵌入猫图和混沌图的彩色图像加密算法

为解决加密算法过于简单，彩色图像安全性相对较低，在传输过程中容易受到攻击的问题，本文将介绍一种新的加密算法，旨在将彩色图像分割成R , G 和 B 层。在加扰操作中：第一次加扰的目的是阻止明文图像加扰；第二次加扰是第一次加扰后密文的动态阿诺德加扰。在扩散操作中，以加扰后的密文图像为输入，嵌入Tent映射和Sine映射生成的伪随机序列。Logistic映射生成的序列用于选择子块用于图像的块扩散。将帐篷正弦映射应用于第二次扩散以获得最终的密文图像。本文设计的算法将图像块置乱和动态Arnold置乱相结合，大大提高了图像各层像素的置乱程度，从而提高了彩色图像的安全性。在扩散过程中，选择混沌序列进行扩散运算，增加了密文解码的难度。仿真结果表明，新算法具有较好的加密效果、较强的密钥敏感性和较大的密钥空间，复杂的加密算法能有效抵抗攻击，在图像信息安全方面具有一定的价值。大大提高了每一层图像像素的置乱度，从而提高了彩色图像的安全性。在扩散过程中，选择混沌序列进行扩散运算，增加了密文解码的难度。仿真结果表明，新算法具有较好的加密效果、较强的密钥敏感性和较大的密钥空间，复杂的加密算法能有效抵抗攻击，在图像信息安全方面具有一定的价值。大大提高了每一层图像像素的置乱度，从而提高了彩色图像的安全性。在扩散过程中，选择混沌序列进行扩散运算，增加了密文解码的难度。仿真结果表明，新算法具有较好的加密效果、较强的密钥敏感性和较大的密钥空间，复杂的加密算法能有效抵抗攻击，在图像信息安全方面具有一定的价值。