A fast and efficient multiple images encryption based on single-channel encryption and chaotic system

A multiple-image encryption algorithm based on single-channel scrambling, diffusion and chaotic system is presented in this paper. The initial values of the chaotic system are associated with the pixel values of each set of encrypted images as the key for each set of image encryption. The pseudo-random sequences and matrixes generated by the chaotic system are obtained by the corresponding keys, and then, the whole set of images are fused across-image and transferred from the RGB channel to the HSV channel after fusion. For single-channel encryption, select one of the HSV channels is extracted and encryption operations of scrambling and diffusion are performed. The index sequences generated by the chaotic sequences with zero frequency shifting rearrange the pixel positions of the encrypted channel. Combining data splitting, stack storage, and chaotic matrixes, the diffusion operation is achieved. Analyses of the performance show that the algorithm has both excellent encryption speed and security performance.