基于GB2312国标码的Word文档零水印算法

Zero-watermarking algorithm about word document based on GB2312

文本水印容易受到格式化攻击,而目前文本数字水印技术主要集中于基于格式方面。提出一种基于GB23212国标码的Word文档零水印方案,该算法利用混沌映射确定被比较的两个汉字,基于汉字GB23212国标码比较两个汉字的大小,进而产生基于文本内容的零水印。该算法不改变文本格式,因此能较好地抵抗改变行距、字间距、字体、字号、复制等格式化攻击,有效提高了算法的鲁棒性及安全性。实验结果表明了该算法的有效性。

The text watermark algorithms are vulnerable to ＂formatting attack＂ The current text watermarking methods are mostly based on format. To avoid formatting attack, a zero-watermarking algorithm about word document based on GB2312 is proposed. A zero-watermarking based on text content can be produced by comparing the GB2312 code of Chinese characters selected by a chaostic system. Formatting attack such as changing line distance, word distance, font, word size and copying can be resisted effectively for no changing text format. Simulation results show that the algorithm improve invisibility and robustness.