组合混沌系统的图像加密算法

Image Encryption Algorithm Based on Combined Chaotic System

为有效保证图像的安全性,针对目前图像加密算法存在的不足,设计一种基于组合混沌系统的图像加密算法.先采用Logistic混沌系统对原始明文图像进行置乱处理,实现图像的像素位置置乱,并对置乱处理后的图像进行分块处理;再采用Henon混沌系统对分块处理后的图像像素进行加密操作,实现对像素值的置乱.用仿真实验对图像加密性能进行测试的结果表明,用该算法加密后,相邻像素相关性较小,具有可靠的传输安全性,实现了图像信息的加密,并增加了密钥空间,提高了图像的各种抗攻击能力.

In order to ensure the security of image effectively, and aiming at the deficiency of current image encryption algorithm, we designed an image encryption algorithm based on combined chaotic system. Firstly, logistic chaotic system was used to process original plaintext image and scramble pixel position of image to carry out image block scramble processing, and then Henon chaotic system was used to encrypt image pixel after block processing, thus realizing the pixel value scrambling. The performance of image encryption was tested by simulation experiments. Test results show that, using the encryption algorithm, the correlation of adjacent pixels is small, and it has reliable transmission security. It can encrypt the image information, increase the key space, and improve the image of various anti attack ability.