基于多混沌系统的多图像加密算法

针对多幅图像在传输中的安全性问题, 本文提出了一种基于多混沌系统的多图像加密算法. 首先, 利用离散小波变换对多幅图像进行预处理, 得到一幅拼接的大图像; 接着, 利用logistic-sine-cosine (LSC)映射生成混沌序列, 进而生成用于置乱的矩阵O对像素位置进行置乱; 最后, 采用超混沌Lorenz系统生成四维混沌序列, 利用其对置乱后的图像进行双向扩散和行列置乱, 获得最终密文图像. 所提算法加解密过程简单, 执行效率高. 实验结果经多方面分析后得出该算法的密钥空间大, 可以抵御多种攻击手段, 具有较好的加密效果和安全性.

Multi-image Encryption Algorithm Based on Multi-chaotic System

Aiming at the security problem of multiple images in transmission, this study proposes a multi-image encryption algorithm based on multi-chaotic systems. First, discrete wavelet transform is adopted to preprocess multiple images to get a large mosaic image. Then, a chaotic sequence is generated using logistic-sine-cosine (LSC) map to generate a matrix O for scrambling pixel positions. Finally, a hyper-chaotic Lorenz system is applied to generate a four-dimensional chaotic sequence. It is used to perform bidirectional diffusion and row-column scrambling on the scrambled image to obtain the final ciphertext image. The proposed method has a simple encryption and decryption process and high execution efficiency. The experimental results have been analyzed from multiple aspects and show that the algorithm has a large key space and can resist multiple attack methods, with good encryption performance and security.