Method and device for information hiding in text document

Abstract

The invention relates to a method and a device for information hiding in a text document. The method includes the following steps: (1) reading all character coding information and text layout attribute information in an electronic text file; (2) converting the electronic text file into a black-and-white binary text image file according to the character coding information and the text layout attribute information; (3) extracting each character image sub-block from the black-and-white binary text image file, detecting the edge pixels of the character image, and getting an edge pixel set; and (4) determining the turning rules of the edge pixels of the character image sub-blocks, and embedding watermark information by turning the values of the edge pixels in the edge pixel set, thus realizing information hiding in a text document. According to the invention, watermark information is embedded by modifying the edge of the character image, the text image embedded with the watermark information has a good visual effect, and the information embedding capacity can be greatly increased.

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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