Algorithm on Text Watermarking Based on Natural Language
Liping Lei · Journal of Guiyang University · 2009
The development of digital technology and the Internet has facilitated the spread of various forms of digital works.At the same time,the characteristics that digital works is extremely vulnerable to reproduce ideally will likely be used by pirates.Digital watermark technique is one of effective means of copyright protection recently.On the basis of a detailed analysis of natural language watermarking,we put forward an asymmetric text digital watermarking algorithm based on natural language.First,digital watermarking is produced using asymmetric algorithm.Second,the index sequence of paragraphs and sentences is permuted using DES and Queue Scrambling.Third,watermarking is embedded by sentence transformation,and during the embedding,multi-degree relativity is introduced.Last,analysis and improvement show that the schemes have higher security,they can prevent from forging the watermarks and trace piracy;copyright certification processes have higher efficiency.The watermarked documents have good robustness.