Image encryption algorithm based on the synchronization of permutation and diffusion
Shu Yonglu · Journal of Lanzhou University · 2012
Digital image encryption is mainly based on two basic principles:permutation and diffusion,which are used separately for an image.But a new algorithm was proposed in this paper that combines them together to achieve synchronous encryption.First,a two-dimensional logistic chaotic map,which was controlled by onedimensional Ulam-von Neuman map,was used to generate two chaotic sequences.Second,the above-mentioned sequences were utilized in the original image.According to a selected image scanning method,a permutation and then a diffusion operation in each pixel time were completed until the entire image encryption was accomplished. Compared with the existing algorithms using permutation and diffusion separately,the simulation results showed that the proposed algorithm has a larger secret-key space,higher security,faster encryption speed and stronger robustness.