C8. An efficient approach for image cryptosystem based on chaotic confusion-diffusion mechanisms

Abstract

This paper presents an efficient confusion-diffusion approach for chaos-based image encryption. The proposed approach for chaos-based image cryptosystems is composed of alternative confusion and diffusion stages. A multi-dimensional chaotic map is usually employed in the confusion stage for image pixel permutation while a one-dimensional (1D) chaotic map is used for diffusion purpose. The proposed algorithm is based on two dimensional (2D) diffusion process which gives higher levels of security to the image. The security analysis of the proposed algorithm is given. The experimental results of the algorithm at different mixture of confusion and diffusion chaotic maps proof the effectiveness of the proposed cryptosystem. This mixture application of chaotic maps shows advantages of large key space and high-level security. The ciphertext generated by this cryptosystem is the same size as the plaintext size and is suitable for practical use in the secure transmission of confidential information over the Internet.