Digital Watermarking Algorithm Based On Chinese Font In The Word Document

With the explosive growth in multimedia and network technologies, intellectual propertyprotection of images, audio, video etc are more urgent than ever. Encryption and copyprotection mechanisms can not fully solve the issue. Encryption usually protects data only on the transport channel and copy protection mechanisms are often circumvented easily. In this context, digital watermarking has been proposed as the last line of defense in the protection of intellectual property. Moreover, watermarking can be applied to authentication, captioning etc Now there are many effective digital watermarking methods for image etc, but these methods are not usually suitable for text.The technology of the text digital watermark is a cross marginal subject which relates to researches of cryptography, graphics, science of vision, Chinese information processing, image processing, communications, and information security, etc and is a very new research direction in theory at present. So far the acquired achievements on text digital watermarking are mainly focused on the algorithms based on text format. The most typical representatives are algorithms on word-shifting, line-shifting and character-coding. As the watermark information of this kind of algorithm is not inserted into the text content, the algorithms can not resist some common document operations such as format conversion, print processing.A multiple text calculating method based on the characters' attributes and the words' content is proposed in this paper, and its merits are also analyzed. It is of good imperceptibility to modify the default numerical values of characters' specific attributes in a Word Document .For example, the character is regarded as the object of range in the Word Document, the default numerical value of NoProofing's attribute can only be modified during programming; and the default numerical value of LanguageIDFarEast, one of the character's attributes, can be modified to wwdTraditionalChinese or wdChineseSingapore.To embed text watermarks, we can modify the default numerical values ofcharacters' specific attributes. Experiments show that the watermarks can be hided effectively and have unlimited capacity. Moreover, it has a good anti-attacking ability and good performance in text integrity detection.