On Research Of A Multiple Watermarking Algorithm For English Texts

With the development of computer technology and the popularization of information technology, it is popular for people to process, transmit and store all kinds of information (for example, image, voice, text, video and so on), so there are a lot of problems on the digital works'copyright protection and the security control of digital signal transmission.To solve these problems, digital watermarking technology has been gradually developed. Digital watermarks may be all kinds of information which can be embedded into multimedia data, just as digits, serial numbers, text, image symbols, so it can be used in copyright protection, marker production, covert communication, data ownership confirmation, data authentication. As digital texts are used on a large scale, it is of theoretical and practical significance to research text watermarking, which is one of the application spheres of digital watermarking.For the deficiency of the current English digital text watermarking, 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 wdTraditionalChinese or wdChineseSingapore.To embed text watermarks, we can modify the default numerical values of characters'specific attributes. So the words with two characters or above are divided into three sets, which are regarded as the objects to be embedded. And all words in every set can be classified into two types. Then according to the different types of the words, the words in every set are embedded into two watermark groups in a specific watermark embedding way, and their contents are associated with embedded watermarks. So during watermarking detection, the action that the attacker deliberately distorts or modifies the watermarking feature by extracting watermarks consciously or not can be found easily, and the text integrity detection performance can also be enhanced. After various attacks or even damages are made to the text content or the...