Lightweight Image Encryption Algorithm Using 4D-NDS: Compound Dynamic Diffusion and Single-Round Efficiency

With the advancement of the Internet of Things (IoT) and communication technologies, multimedia information has become a significant component of communication. Image data, as a carrier with high information density and large transmission volume, is increasingly at risk of information leakage. To address the issue of digital private image leakage, this paper proposes a reliable image security protection scheme based on non-degenerate hyper-chaotic systems for dynamic permutation and single-round combined diffusion. By leveraging the high dynamic properties of non-degenerate chaos, the scheme effectively resolves the insufficient sensitivity of pseudo-random sequences to initial values. Additionally, the single-round combined double-diffusion system significantly enhances the encryption efficiency of the algorithm. Experimental and theoretical verification demonstrate that the algorithm exhibits high sensitivity and effective robustness, capable of resisting common attacks and providing a reliable security solution for communication and IoT.