摘要： 针对单一混沌加密算法安全性较差的问题，提出一种基于扰动的二维混沌加密算法，利用二维Chebyshev映射和m-序列扰动作为混沌发生器，用于加密水印图像。将彩色载体图像绿色分量进行3级小波变换，提取其低频部分作为嵌入区域。将加密后的水印嵌入绿色分量的低频部分。实验结果表明，该算法计算速度较快，可以抵抗JPEG压缩、噪声、滤波等攻击，具有较好的数字水印特性。

关键词: 小波变换, 混沌加密, 盲数字水印, 质量因子, 图像置乱

Abstract: In order to increase the security of chaos-based encryption algorithm while not affecting the performance, a kind of encryption algorithm based on a two-dimensional Chebyshev maps with the combination of the m-sequence of the chaos is put forward. During the embedding of the watermark, discrete wavelet transform is done to the green luminance of RGB color space and low frequency part is extracted as the embedding field. The watermark is encrypted by using the compound chaotic sequence and is embedded into the low frequency part of the green luminance. Experimental results show that this watermark technique, in which the encrypting and embedding algorithms have less computational capacity, can resist JPEG compression, noise attack, filter and so on, as well as good digital watermark performance.

Key words: wavelet transform, chaotic encryption, blind digital watermark, quality factor, image scramble

中图分类号: 

• TP391