Research on Pixel Reorganization and Fast Diffusion Algorithm of Chaotic Image

This paper proposes a color picture encryption algorithm with pixel restructuring and quick diffusion to coexist the security and operational efficiency of the image encryption system. The algorithm employs a four-dimensional hyperchaotic system to decompose the pixels of a color image's three channels twice and reorganize them through the index matrix twice to generate three new channels. Three-dimensional and six-way parallel diffusion of the three channels of the color image is performed in the diffusion stage using a matrix, vector, and single pixel as the diffusion units, which not only ensures the complexity of the algorithm and ensures the safety performance, but also improves the operating efficiency of the diffusion stage. According to the simulation experiment and performance analysis, the algorithm has a good encryption and decryption effect, a large key space, high key sensitivity, strong security, can resist differential attacks, statistical analysis, and has good robustness