A fast color image encryption scheme based on the new chaotic structure and dynamic strong S-boxes

As the Internet of Things develops by leaps and bounds, digital image is more susceptible to attacks, thus images are encrypted to protect their security. Chaotic system is extensively wielded in image encryption owing to its characteristics, but it also has some defects, such as limited parameter range and vulnerability to attack. For obtaining a more secure encryption algorithm, this paper first proposed a new chaotic structure. The one-dimensional maps can be applied to this chaotic structure to generate the corresponding novel full chaotic maps. The chaotic performance analysis such as bifurcation diagram, Lyapunov exponent and sensitivity analysis verifies that the proposed novel full chaotic maps have excellent chaotic performance, large parameter space, strong sensitivity and high randomness. Then based on the novel full chaotic maps, the dynamic S-boxes generation scheme is designed. Finally, a new color image encryption scheme puts forward ground on novel full chaotic maps and S-boxes. The algorithm uses Arnold transformation to interfere with the color images and replaces them with S-boxes, and then the encrypted images are obtained by diffusion through the modulo addition operation. Simulation results demonstrate that this new secure image encryption scheme has a preferable encryption performance on the image and high execution efficiency, which can prevent various attacks and ensure the security of the image.