An efficient colour image encryption scheme based on 1-D chaotic maps

Nowadays, internet is the medium through which people are sharing digital images. However, security is an issue in sharing of those images. Encryption techniques play an important role for the security of images. In this paper, an efficient colour image encryption scheme is proposed using multiple piece-wise linear chaotic map (PWLCM) systems. The proposed scheme first performs two-times multi-way block-based rotational permutation operations and then row-column rotational permutations. Finally, it performs row, column, and block diffusion operations. This scheme is simple and secure because it involves only simple rotational permutation operations using only PWLCM systems. Also, this scheme is efficient because it requires less computations and less simulation time to encrypt colour images. The advantages of this scheme are high key space, high security, simplicity and high efficiency in terms of computational complexity and simulation time. The simulation outputs and the security analyses indicate that the proposed method has better performance in terms of encryption efficiency, security, and resistivity for most of the common attacks. (C) 2019 Elsevier Ltd. All rights reserved.