Fragile Watermark Algorithm in RTF Format Text
Sheng-He Sun · Jisuanji gongcheng · 2007
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.