Fragile Text Digital Watermarking Based On Crc Research And Applications

Recently,some researchers began to realize the importance of watermarking on text documents and proposed some robust watermarking techniques for protecting the copyright of text documents. Even though it is very important to verify the copyright of a text document,however in some cases,it is more essential to verify the authenticity and integrity of text documents.The documents can be detected for tamper by recalculating the residue of CRC while chock the watermark of document. With further research, the solution proposed can be capable of either detecting and locating tamper very precisely and exactly, or classifying the tamper in means of insert,deletion,or update.When it is proposed a fragile text watermarking scheme for text content identification based on words movement coding and CRC techniques in this paper. The watermark required is embedded into the target documents in way of moving the words within a line, which is used by changing the distances of words. It is a technique implemented firstly by obtaining the characteristics of a string with CRC techniques,and then by embedding the characteristics in a mean of coding into the different distances among variant words of the documents. The documents can be detected for tamper by recalculating the residue of CRC while check the watermark of document. With further research,the solution proposed can be capable of either detecting and locating tamper very precisely and exactly,or classifying the tamper in terms of insert, deletion, or update.In the project evaluting procedure of network evaluation system, it is necessary for the experts to check the project's materials which are presented through Internet.In order to protect these digital documents effectively and effeciently in network environment,accord with the security requirements of network evaluation,it is proposaled a new and effective solution base on the fragile text digital watermark mentioned above.