A Fast Image Encryption Method Based on a Novel One-Dimensional Chaotic Map and Dynamic S-box

To enhance the speed of image encryption systems and address the efficiency issues of dynamic S-boxes in practical image encryption applications, this paper proposes a fast image encryption method based on a novel one-dimensional chaotic map and dynamic S-boxes. The method introduces a new chaotic map to expand the parameter space of the encryption system, thereby strengthening the system’s resistance to exhaustive attacks. Additionally, dynamic S-boxes are used for nonlinear transformations of different pixel points, replacing the permutation phase in the pixel encryption process. This eliminates the correlation between adjacent pixels, thus avoiding the time consumption caused by the permutation phase during encryption. The paper conducts detailed experiments on the proposed algorithm, and the experimental results demonstrate a significant improvement in efficiency compared to other image encryption methods, with an average increase of 50%. Furthermore, the proposed method demonstrates a clear advantage in decryption quality, effectively restoring plaintext images when processing ciphertext images contaminated by noise. These experimental results validate the effectiveness and innovation of the proposed method.