摘要： 提出了一个基于广义同步混沌系统和Hash 变换的图像加密方案，它利用抽取后的混沌信号及Hash 变换得到图像加密的行列变换序列和置乱矩阵，并通过两次迭代实现了图像加密变换。而后给出了一个基于Chen’s 广义同步混沌系统的实现方案，理论分析及实验结果显示，该方案密钥空间大，加密图像对密钥和原始图像都非常敏感，加密效果良好，算法安全性高。

关键词: 广义同步混沌；图像加密；Hash 函数；灵敏性

Abstract: This paper presents a new image encryption scheme based on generalized synchronization chaotic systems and Hash functions. The new scheme implements the image encryption by means of twice iterations based on confusion matrix and transformation sequences generated by sampling chaotic signals and Hash functions. As a direct application of the scheme, Chen’s GSCS is studied in som detail. Theoretical analysis and experimental results demonstrate that the cipher-image is sensitive to initial conditions of chaotic system and original image, the key space is great.So the scheme is of favorable and reliable for secure communication.

Key words: Generalized synchronization chaotic system (GSCS); Image encryption; Hash function; Sensitivity