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摘要:近年来，计算机网络通信技术的飞速发展，为数字信息化的传播带来机遇，同时为数字信息化的保护带来了新的挑战。数字水印技术因其在多媒体版权保护、媒体认证技术方面所具有的优势，逐渐成为人们研究的热点。在所有人类的传播媒介中，文字的地位最为重要。可以确定的是，无论传播技术和媒体形式如何变化，在可以预见的将来，文字在传承人类文明和推动社会进步上的作用是其他任何形式的媒体难以比拟的。因此，在文本中嵌入数字水印进行版权保护、内容认证、操作跟踪具有十分重要的意义。基于Word文档的信息隐藏技术既隐藏信息的内容又隐藏信息的存在，它作为确保计算机网络信息安全的一个重要手段正成为信息安全领域的热点之一。4839
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本文在研究、分析和总结现有信息隐藏算法基础上，设计了比较新颖的基于Word文档的信息隐藏方法，并进行了基于此种方法的信息隐藏系统的实现。这是一种基于碎片重组策略的Word信息隐藏算法。该算法利用字符的两种颜色特征，即字符颜色、字符下划线颜色，采用水印碎片重组策略嵌入水印信息。实验结果表明，同现有大多信息隐藏算法相比，该算法能够同时具有较强的水印鲁棒性、较大的水印容量以及较好的水印隐蔽性等特点，并具有良好的扩展性。
通过提取这些嵌入的隐藏信息，可以获知是否有人对文件进行过更改，从而在一定程度上对该文件起到了信息追踪和版权保护的作用。最后，大量实验证明，这些算法在实验和实践中都具有可行性。
关键词：防篡改；文本数字水印；word文档；水印嵌入；
Digital Watermarking systems in the Word Document
Abstract: Recently, with the fast development of communication technology in computer network, both the new chances and challenges have been created for protection the digital information. In fact, the paper document is more valuable than other digital medias. It is doubtless, no matter how change in transmitting way and media type, the role of transferring the human civilization and impelling the social advancement is played only by character Therefore, It is important meaning, text is embedded the digital watermarking for protecting copyright, authenticating content and tracing operation The information hiding technique can hide the content and existing of information and it is an important method to insure the computer network information security. It is becoming one of hot research topics in information security field.
On the basis of studying, summarizing and analyzing the existing algorithms, this paper designs two novel methods based on word document, and implements two information hiding systems based on the methods respectively The first one is word information hiding algorithm based on watermarking fragments regrouping strategy. In the algorithm a character's three color features (font color, underline color, and border color) are utilized to embed watermarking based on the fragments regrouping strategy. Experiment results show the method has the following advantages: stronger watermarking robustness ,greater watermarking capacity, better watermarking imperceptibility and better expansibility compared with most of the existing information hiding algorithms. The second one is word information hiding algorithm based on structured storage.
By extracting the embedded information from the file, we can know that who modified the file, and when or where the file was modified. Thus, to some extent, the method plays the role of information tracking and copyright protection to the file. Eventually , these algorithms are feasible in terms of theory and practice by proof of abundant experiment.
Keywords: Digital watermark; word documents; Inserts;
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