篇章层自然语言数字水印方法-计算机工程.PDFVIP

36 12 2010 6 Vol.36 No.12 Computer Engineering June 2010 ·· 2010 A TP393 1 2 (1. 410082 2. 410002) Natural Language Digital Watermark Method on Paragraph Level 1 2 LIU Yu-ling , XIN Guo-jiang (1. School of Computer and Communication, Hunan University, Changsha 410082; 2. Department of Information and Technology, Hunan Network Engineering Vocational College, Changsha 410002) AbstractThis paper proposes a natural language digital watermark method on paragraph level, by introducing spread spectrum technique to encode the watermark. All the named entities are picked out to create a vector space. A sub-space is selected to embed watermark according to the secret key. In order to embed watermark, the number of named entities is modified by employing the anaphora technique. Whether the watermark is embedded in text is determined by comparing the extracted vector with the vector generated by the original watermark. Experimental results show that the method is robust, and can resist some common active attacks. Key wordsdigital watermark; paragraph level; spread spectrum; named entity; anaphora resolution 1 n S M. J. Atallah V. Raskin TMR TMR 1 TMR [1] O. Vybornova