一种基于广义Chen’ s混沌系统的图像加密新算法

来源期刊：中南大学学报(自然科学版)2006年第6期

论文作者：朱从旭 陈志刚 欧阳文卫

文章页码：1142 - 1148

关键词：混沌;图像加密; Chen’s混沌系统;混淆;扩散

Key words：chaos; image encryption; Chen’s chaotic system; confusion; diffusion

摘    要：根据高维混沌系统具有更高安全性的特点,提出一种基于三维Chen’s混沌系统的数字图像加密新算法,通过置乱图像像素的空间位置和改变像素值来混淆密文图像和明文图像之间的关系。利用Chen’s混沌系统的二维序列置乱图像像素的空间位置;然后,由Chen’s混沌系统输出的三维混沌序列得到适合灰度图像或真彩色图像加密的密钥序列,利用混沌密钥序列对置乱图像进行逐像素加密。研究结果表明,该算法具有良好的像素值混淆、扩散性能和较大抵抗强力攻击的密钥空间,加密图像像素值具有类随机均匀分布特性,且相邻像素值具有零相关特性,所提出的方案具有较高安全性。

Abstract: According to the characteristics of higher secrecy of high-dimension chaotic system, a new digital image encryption algorithm based on 3D Chen’s chaotic system was proposed, and the relationship between the cipher-image and the plain-image was confused by scrambling the positions and changing the values of image pixels. The two chaotic sequences of the Chen’s chaotic system were used to shuffle the positions of the image pixels in the spatial-domain. Then the three chaotic sequences of the Chen’s chaotic system were adopted to generate key sequences for the grayscale image or true color image encryption, and the shuffled image was encrypted by the key sequences pixel by pixel. The results demonstrate that the algorithm has good properties of confusion and diffusion. The key space is large enough to resist the brute-force attack. For the encrypted image the distribution of pixel-values has a random-like behavior and the values of adjacent pixels satisfy zero correlation, showing that the proposed scheme is of high security.