摘要： 提出一种新的图像混沌置乱及加密方法，利用2个耦合混沌映射产生混沌序列对，利用该序列对通过变换形成图像像素新的地址码，对原始图像进行混沌置乱，得到置乱图像。对乱序图像进行离散余弦变换(DCT)，在DCT域内利用一个混沌序列对每个系数进行改变，从而对图像进行加密。恢复图像时，其解密和反置乱过程与上述过程相反。仿真实验结果表明，该方法简单易行，具有较强的安全性和可操作性。

关键词: 耦合映射, 混沌置乱, 混沌映射, 混沌加密, 解密

Abstract: This paper proposes a novel chaotic scrambling and encryption method of image. It uses two coupled chaotic maps to generate a sequence of chaotic pairs, disorder the original image with the new pixel address codes which are produced by these pairs and gain disordered image, transforms the disordered image by Discrete Cosine Transformation(DCT), and change every DCT coefficient of image with the aid of a chaotic sequence in DCT domain to complete the encryption of image. The process of decryption and the anti-scrambling is the inverse of the process above. Simulation experimental results show that the method is feasible, security and easy to operate.

Key words: coupled maps, chaotic scrambling, chaotic maps, chaotic encryption, decryption

中图分类号: 

• TP309.2