Paper 2010/046

A New Chaos-Based Cryptosystem for Secure Transmitted Images

Abir AWAD

Abstract

This paper presents a novel and robust chaos-based cryptosystem for secure transmitted images and four others versions. In the proposed block encryption/decryption algorithms, an 2D chaotic map is used to shuffle the image pixel positions. Then, substitution (confusion) and permutation (diffusion) operations on every block, with multiple rounds, are combined using two perturbed chaotic PWLCM maps. The perturbing orbit technique improves the dynamical statistical properties of generated chaotic sequences. The obtained error propagation in various standard cipher block modes demonstrates that the proposed cryptosystem including OFB, or CTR modes, is suitable to transmit cipher data over a corrupted digital channel. Finally, to quantify the security level of the proposed cryptosystem, many standard tools are performed and experimental results show that the suggested cryptosystem has a high security level.