Method and device for information hiding in text document

Abstract

The present invention relates to a method and device for hiding information in text documents. The method includes: 1) reading all character encoding information and text typesetting attribute information in the text file in electronic format; 2) converting the electronic format text file into a black and white binary text image file according to the character encoding information and the text typesetting attribute information; 3) extract each character image sub-block in the black and white binary text image file, and perform character image edge pixel point detection to obtain the edge pixel point set; 4) determine the flip rule of the edge pixel point of the character image sub-block, by The inversion of the edge pixel value in the edge pixel set is used to embed the watermark information, so as to realize the information hiding in the text document. The invention embeds the watermark information by modifying the edge of the character image, the text image after embedding the watermark information has a good visual effect, and the information embedding capacity can be greatly improved.

Description

technical field [0001] The invention relates to an information hiding method and device in text documents, in particular to a method and device for information hiding in black and white binary text image documents. Background technique [0002] With the advent of the information age, especially the rapid popularization of Internet technology, the protection of information security has become increasingly prominent. The current information security technology is basically based on cryptography theory. Whether using the traditional key system or the public key system, the protection method is to control the access of files, that is, to encrypt files into ciphertext, so that illegal users Can't read. However, with the continuous improvement of computer capabilities, this method of increasing the key length to improve system security is becoming more and more unreliable, and the ciphertext is easy to attract the attention of attackers. Therefore, a new information security tec...

AI Technical Summary

Problems solved by technology

[0012] The present invention provides an information hiding method in a text document, which is used to solve the problems in the prior art that the amount of watermark information embedded in the text document is small and the visual effect is poor, and is further used to solve the problem of low security of the watermark information , the embedding and extraction process has high computational complexity and low detection accuracy

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