A color image encryption with heterogeneous bit-permutation and correlated chaos

In this paper, a novel color image encryption with heterogeneous bit-permutation and correlated chaos is proposed. Considering the difference of information amounts between bit-planes, the author employs heterogeneous bit-permutation to reduce computation cost and improve permutation efficiency, then performs expanded XOR operation for R, G, B components of color images, thus obtains cipher color images. The correlated chaos is introduced, which not only provides us a new way when making initialization for chaotic maps, but also takes fully use of chaotic maps. The architecture of permutation and diffusion is employed, and one-dimension WPLCW chaotic maps are used to generate pseudo-random sequences during the whole encryption process. The experiment results and analysis have proved the proposed color image encryption algorithm is secure and effective. (C) 2014 Elsevier B.V. All rights reserved.