A color image encryption algorithm using slide Zigzag scrambling with two-dimensional hyperchaotic system

Abstract Images are crucial information carriers in daily life, but they are vulnerable to various attacks. Therefore, ensuring their security during transmission is of utmost importance. Combining image encryption with chaotic maps can effectively enhance the security of image encryption. Therefore, this paper proposes a novel two-dimensional chaotic system, the 2D Sine-Logistic-Cosine chaotic system, based on the Sine map, Logistic map and Cosine function. The system exhibits a large number of parameters, an extensive parameter range, and excellent chaotic performance. To effectively address the issue of unchanged pixel positions in traditional Zigzag permutation, a novel color images encryption algorithm is introduced. In the permutation process, a sliding Zigzag permutation method is proposed by integrating the traditional Zigzag permutation with the index values of a chaotic sequence. The RGB channels of the color image are first rearranged based on the index values of the chaotic sequence and the Zigzag permutation. Subsequently, pixel values are further scrambled across the three channels according to the index sequence. Finally, an overall pixel shift-based Zigzag permutation is applied to disrupt pixel positions. For diffusion, pixel operations are refined to the bit level. Pixel values are converted into binary form and shifted according to the values of the chaotic sequence. Simulation results, correlation analysis, and differential attack analysis demonstrate that the proposed algorithm exhibits strong security performance and holds significant potential for color image encryption applications.