摘要： 基于网格状多涡卷蔡氏混沌系统和离散余弦变换(DCT)理论，提出一种改进的数字水印算法。采用网格状多涡卷蔡氏混沌系统生成的混沌序列作为密钥，增强算法的安全性；利用网格状多涡卷混沌系统复杂的混沌动力学行为，弥补低维混沌系统用于数字水印时密钥空间过小的缺陷。实验结果表明，该方案在抗几何攻击、抗裁剪和密钥空间抗穷举攻击方面具有较好的特性。

关键词: 数字水印, 混沌数字水印, 网格状多涡卷, 混沌吸引子, 超混沌, 密钥空间

Abstract: Based on the grid multi-scroll Chua’s chaotic attractors and Discrete Cosine Transform(DCT) algorithm, a novel digital image watermark algorithm is proposed in this paper. It improves digital watermark algorithm using the grid multi-scroll Chua’s chaotic sequences generated by chaotic systems as the key, which greatly enhanced the security of the algorithm. The complex dynamic behavior makes up the existence of defects in the key space is too small. Experiment results show that the scheme has excellent characteristics of resistance to geometric attacks, shear, and brute-force attacks against the key space and has good features.

Key words: digital watermark, chaotic digital watermark, grid multi-scroll, chaotic attractors, hyper-chaos, key space

中图分类号: 

• TP309