Method for embedding and extracting frequency domain water mark in English text

A text and English technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of watermark information influence, text watermark information loss, difficult to resist attacks, etc., and achieve the effect of enhancing robustness
CN101169779AInactive Publication Date: 2008-04-30TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2008-04-30
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a method for embedding and extracting a frequency domain watermark in an English text, belonging to the technical field of computer file protection. The method comprises acquiring an adjective or an adverb w from the English text T; finding a synonym assembly Sw from w as a dimension of a vector vc in the text T; finding an agent word wd from w; performing Hash operation to private key information k of a copywriter of the file to obtain a long integer R; dividing R by a preset grouping number n, (n is a positive integer) to obtain a grouping number i of the current Sw; performing single-direction Hash operation of each word ws in Sw with k, determining the oddity of the obtained remainder, and respectively adding into an assembly Ai and an assembly Bi; using the number of words ci of Ai as the vector vc of the English text T; setting a watermark vector vw corresponding to the text vector vc as the watermark information to be embedded or extracted. The method also comprises embedding and watermark detecting steps. The invention can be used for the original text protection.
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Description

technical field

[0001] The invention belongs to the technical field of computer text protection, in particular to a method for embedding and extracting frequency-domain watermarks in English texts. Background technique

[0002] As an effective means of computer text 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...

Claims

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