High-Sensitivity Chaotic System for Image Security: Applications to Multi-ROI Encryption

To ensure the security and privacy of images, this paper proposes an Improved 1D Sine–Logistic (I1DSL) chaotic system and its application in multiple Regions of Interest (ROI) image encryption. As the security foundation, the I1DSL chaotic system is employed to generate highly secure chaotic key streams. Performance analysis demonstrates that it exhibits superior dynamic behavior and a broader parameter space. During encryption, YOLOv10 is used to extract ROIs and generate keys accurately. For each ROI, a selective scrambling is applied to achieve a uniform and unpredictable pixel distribution. In image diffusion, a Multi-directional Dynamic Josephus (MDJ) matrix is introduced to realize synchronous scrambling and diffusion of multiple ROIs. Finally, a global random scrambling process is applied to ROIs of different sizes to further enhance the overall randomness and security of the encryption. Experimental results demonstrate that the proposed multi-ROI image encryption algorithm exhibits excellent performance in both security and efficiency, further validating the security of the I1DSL system.