基于动态S盒与混沌映射的图像加密方案优化OA

Digital images face severe security threats in network transmission,and traditional encryption methods have shortcomings in non-linear strength and anti-attack capability.Therefore,an image encryption optimization method based on dynamic S-box and chaotic mapping is proposed in this study.This method generates a high-strength key stream through a hyper chaotic Chen system,dynamically constructs an S-box with a fractal index ma-trix,and introduces a two-dimensional coupled mapping lattice and dynamic coding operation of deoxyribonucleic acid to achieve pixel level obfuscation diffusion collaborative encryption.The experimental results show that this method achieves an encryption time of only 28.1 ms and a throughput of 147.4 MB/s in 2 048×2 048 images.In terms of security,when the image size is 2 048×2 048,the maximum entropy of ciphertext information is 7.997.In the anti-attack test,the method maintained a minimum peak signal-to-noise ratio of 28.3 dB even when the Gauss-ian noise variance was 0.10.The method performed excellently in terms of encryption efficiency,security,and anti-attack capability,providing a real-time and robust solution for digital image protection and having significant engi-neering application value.