摘要： 混沌系统对初始条件和混沌参数非常敏感，生成的混沌序列具有非周期性和伪随机性的特性，近年来在图像加密领域中得到了广泛的应用。该文提出了一种基于改进的混沌猫映射的图像加密算法，该算法利用混沌猫映射和扩散函数相结合来对数字图像进行置乱加密。改进后的混沌猫映射不仅可以基于像素点进行空间域的变换加密，而且可以基于色度域进行变换加密，从而可以有效地抵抗统计攻击。实验结果表明，提出的算法能够得到令人满意的加密效果。

关键词: 混沌, 图像加密, 猫映射, 扩散

Abstract: Chaos is widely used in image encryption because of its high sensitivity to initial conditions and parameters and its generated chaos series without circle and of pseudo stochastic. An image encryption algorithm based on improved chaotic cat maps is proposed. In this method, the image is encrypted by diffusion function and improved chaotic cat maps, which can encrypt image not only based on disordering the positions of image pixels but also based on changing image pixels’ value, thereby significantly increasing the resistance to statistical attacks. The method is proved to work well.

Key words: Chaos, Image encryption, Cat maps, Diffusion

中图分类号: 

• TP391