Indian Journal of Science and Technology

Abstract

In this paper, a three layer image cryptosystem for grayscale images is introduced to provide an efficient security for symmetric images. The proposed image encryption algorithm contains a 3D Arnold cap map for pixels’ value shuffling and pixels’ value substitution in the first layer. Followed by a Sudoku permutation layer which takes a Sudoku matrix and key as an input. The alternative block rotation mechanism is used to rotate the pixel values in the last layer. The confusion and diffusion properties of the 3D Arnold cat map together with Sudoku matrix and rotation provide good permutation and substitution for the image at each round. This proposed algorithm has a huge key space and has the desired secure cipher property. The security analysis is done in MATLAB, the simulation results demonstrates the robustness against differential attack models. The results conclude that the algorithm is best suitable for image encryption which requires efficient and fast encryption scheme.
Keywords: Chaotic 3D Arnold Cat Map, Image Encryption, Permutation, Substitution, Sudoku Matrix