Color image encryption algorithm based on customized globally coupled map lattices

In this paper, we proposed a color image encryption scheme based on chaos and Customized Globally Coupled Map Lattices, which is firstly brought out by our research group. The presented algorithm consists of four steps. Firstly, decompose RGB image to three channels red, green and blue. A simple but useful logistic map is used to generate a key image that has the same size with the original image. Secondly, regard the red channel, green channel, blue channel and the key image as a whole image, then shuffle this image. After that, segment shuffled image to four same size images, named A, B, C and D. Finally, conduct the confusion operations and then choose one image as key image from these four parts. Combine the rest three parts, cipher image is obtained. Experimental results and data analysis demonstrate that the proposed algorithm has the strong capacity of resisting typical attacks and the good security.