Method and device for text recoverable watermark based on synonym replacement

Abstract

The invention relates to a method and device for a text recoverable watermark based on synonym replacement, belonging to the technical field of copyright protection of computer texts. The water recoverable watermark is a technology of embedding secret information into a text and recovering the original text while extracting corresponding watermark information. In the method and the device, words with synonyms in the text are simulated into pixel value pairs, integer reversible transform is utilized for embedding or extracting copyright information and the original text is recovered while extracting the copyright information. The method and the device have the advantages of recovering the original text while extracting the copyright information. The method and the device can be applied in the fields with high requirements on text contents, such as military affairs, law, literature and the like, not only ensure the copyright of documents, but also prevent the ambiguity interpretation oflegal users.

Description

Technical field [0001] The invention belongs to the technical field of computer text copyright protection, and in particular refers to a text recoverable watermark method and device based on synonym replacement. technical background [0002] With the rapid development of computer technology and network technology, the importance of information security has become increasingly prominent. Copyright protection technology is an important branch in the field of information security, which can effectively protect the copyright of various information carriers from infringement. Text documents are the most widely used and frequently used carrier on the Internet, so text copyright protection is particularly important. In recent years, as an important branch of text copyright protection technology, text watermarking technology has become more and more practical, giving birth to a lot of research on text watermarking. [0003] At present, text watermarking can be roughly divided into three ...

AI Technical Summary

Problems solved by technology

Comparing these three types of text watermarking methods, we can find that: the text watermarking of the first two types of methods has poor robustness, cannot resist common OCR (optical character recognition), heavy copy and format conversion attacks, and cannot be applied to plain text ; However, text watermarking based on natural language has strong robustness and good concealment. Therefore, text watermarking technology based on natural language is the most popular and promising part of the current text watermarking field, and a large number of research results have emerged.

However, text watermarking based on natural language also has its disadvantages: text watermarking based on natural language will distort the meaning of words and even the entire text (we call it meaning distortion)

[0007] Although recoverable watermarking has achieved some research results in image, audio and video carriers, no researchers have studied recoverable watermarking for text

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