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Method for embedding and extracting watermark in English texts

A technology that embeds watermarks and English. It is used in special data processing applications, instruments, and electrical digital data processing. It can solve the problems of loss of text watermark information, difficulty in finding file formats, and no extra space, so as to maintain writing style and privacy. The effect of good sex and good writing style

Inactive Publication Date: 2005-11-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People can design watermarking schemes for any file format, but it is difficult to find a watermarking technology suitable for all file formats
[0004] (2) Files in various formats can usually be converted to each other, and even the plain text content in the file can be directly extracted, such as selective paste in word, only copying and pasting unformatted text will completely lose the text watermark information based on the format
The text is composed of characters, each character has a fixed encoding, and there is no extra space for embedding watermark information

Method used

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  • Method for embedding and extracting watermark in English texts
  • Method for embedding and extracting watermark in English texts
  • Method for embedding and extracting watermark in English texts

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Embodiment Construction

[0030] The method for embedding and extracting watermark in text proposed by the present invention, wherein the flow chart of embedding watermark is as follows figure 1 As shown, firstly, the copyright information of the copyright owner is converted into a binary bit string, whose length is L b ;Read the first sentence of the English text, filter out spaces and special characters in the sentence, special characters refer to all symbols except English letters (52 uppercase and lowercase), and get a string with only English characters , perform a one-way hash operation according to the string and the private key information of the copyright owner. The characteristic of the one-way hash operation is that the input parameter is information M of any length, and an integer value of a fixed length is returned to obtain a long integer Z; according to Application needs, set a watermark embedding ratio R, divide Z by the embedding ratio R, if not divisible, read the next English text se...

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Abstract

The invention relates to a method for embedding and extracting water spot from English text in the field of text copyright protection technique. It has the following steps: changing the copyright information into binary bit string, reading in the text and filtering special characters and indent and then operating the character string and copyright person's private key to obtain integer number Z, if Z can divide embedding ratio exactly, the next sentence is water spot information sentence, using Z to do negation with copyright information binary bit string to ascertain the information bit of bided embedding water spot, using Z to do negation with the number of the characters of water spot information sentence to ascertain the location of the water spot information bit so that 0, 1 which can represent the relation of the adjacent alpha codes are uniform with bided embedding water spot information bit until finish text. The process of extracting water spot information is a reverse process of embedding it.

Description

technical field [0001] The invention relates to a method for embedding and extracting a watermark in an English text, belonging to the technical field of text copyright protection. Background technique [0002] As an effective means of copyright protection, digital watermarking has increasingly become the focus of research. However, most of the current research on digital watermarking technology focuses on image, audio, and video data, and relatively little research on text watermarking. This is mainly due to the particularity of the text, and it is difficult to watermark the text: [0003] (1) Text is composed of content and format. Due to the different ways of expressing the content of the document, the format of the text document is also different. There are many types of text files, and the file formats are also various, such as WORD documents ( * doc), Web pages, plain text, PDF, etc. People can design a watermark scheme for any file format, but it is difficult to f...

Claims

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Application Information

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IPC IPC(8): G06F17/21
Inventor 王建民张荣奇李德毅叶晓俊张指浩
Owner TSINGHUA UNIV
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