基于RTF格式的文本脆弱水印算法

文本水印算法容易受到格式化和存储攻击。该文提出一种基于RTF格式的文本脆弱水印算法，能够抵抗格式化和存储攻击，并且对文本段落拷贝时，文本水印不丢失。对文本段落的任何修改都能在水印提取验证段检测出来。分析了3种水印攻击手段。介绍了该水印的实现算法，并对文本水印攻击检测给出了实验结果。

Fragile Watermark Algorithm in RTF Format Text

The current text watermark algorithms are vulnerable to “formatting attack” and “saving attack”. To solve the problem, a fragile watermark is proposed to protect rich text format file. The algorithm can resist the above two attacks. The watermark will not be lost when some paragraphs embedded watermark is copied to other RTF file. Receiver can extract watermark from a RTF text and detect whether the text is modified or not. Three attack methods aiming at text watermark algorithms are proposed and analyzed. And the design of text watermark algorithm is also introduced in form of pseudo code. The experiments show that fragile watermark can detect such three attacks.