Improved reverse zigzag transform and DNA diffusion chaotic image encryption method

In this paper, we propose a chaotic image encryption method based on an improved reverse Zigzag cyclic traversal algorithm combined with DNA coding. The original Zigzag algorithm cannot change all pixel positions at once due to the limitation of the traversal method, and our improved traversal method modifies the original traversal order to reverse zigzag cyclic traversal, after which the image is scrambled with a secondary chaotic sequence. Secondly, the diffusion of DNA pixels is completed after the scrambling operation on the image on the screen. Finally, as an example to further deepen the encryption effect, the image of the chaotic sequence is diffused and the final encrypted image is obtained. Experiments show that the algorithm in this paper has high security. Compared with the original algorithm, the improved reverse Zigzag algorithm has better traversal effect and higher efficiency. Meanwhile, the combination of DNA encoding makes the algorithm more resistant to attacks and can effectively resist common types of attacks.