基于二次余数的Word文档数字水印  

Digital Watermarking in Word Document Based on Quadratic Residue

作　　者：于晨斐[1] 

机构地区：[1]华东理工大学信息科学与工程学院,上海200237

出　　处：《计算机仿真》2007年第11期324-326,共3页Computer Simulation

摘　　要：目前电子文档的使用越来越广泛,尤其是Word文档。由此提出了一种基于二次余数的Word文档数字水印算法。由于中文文本自身的特点,使字移编码不太适合于中文文本水印。该算法依据二次余数理论来自适应的嵌入水印信息,在中文文本中实现了字移编码,并且有较大的信息隐藏容量;提取水印时不需要对比原始文本,实现了盲提取;结合非线性动力学系统的Logistic映射产生的混沌序列,对原始水印图像进行了改进的魔方变换,置乱效果更好,从而进一步提高了鲁棒性。实验表明,该算法具有良好的不可见性;Word文档常见的格式调整等并不会破坏水印。At present the electronical document is used more and more popular, especially Word document. So an improved digital watermaking algorithm in Word document is proposed. Because of the characteristic of Chinese text, word - shift is not suitable for Chinese text watermark. The algorithmm realizes word - shift coding in Chinese text by embeding watermark information adaptively based on quadratic residue and has a bigger hiding capacity. Watermark information can be extracted without orginal text. In order to improve robustness, watermark information is encrypted by an improved Magic Cube Transformation combined with the chaos sequences which are produced form Logistic mapping in non - linear dynamic system. The experiment shows that this algorithm has good perceptual transparence. The ordinary format modification can not destroy watermark.

关 键 词：字移编码 二次余数 魔方变换 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]