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

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.

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...

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 disadvantage of this method is that it is difficult to resist the attack of the same semantic transformation. Sometimes adding or deleting a word in the text may affect the watermark information.

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