An image encryption scheme based on DNA coding and permutation of hyper-image

An image encryption algorithm based on substitution and permutation is proposed in this paper. The original image is encoded into DNA sequence and hyper-image respectively for better disposal. The encryption algorithm is composed of substitution in the DNA format and permutation in the hyper-image format, both of which have eliminated the relation between adjacent pixels in the image and adjacent bit planes in one pixel sufficiently. Besides, a random sequence generator based on the hyper-chaotic system is proposed, which has been utilized both in deciding the complementary ‘nucleoside’ in the substitution process and in constructing the hyper-image for the permutation process. Large quantities of experiments have demonstrated the validity and efficiency of the proposed scheme.