Text steganographic method based on keyword replacement

Abstract

The invention relates to a text steganographic method based on keyword replacement, in which important keywords can be replaced by the keywords desired by a sender through the replacement of two different forms of keywords so as to achieve the aim of freewill misleading. During the steganography, the keywords can be selected at will; keys are generated according to the relationship between the keywords before and after the replacement; and the original text can be extracted by a receiver according to a main key. The replaced keywords are determined by the sender, so that the replaced keywords have good pertinence and a better misleading effect and are difficult to show slips. In the opinion of a listener (opponent) that intercepts a disguised text, the sent disguised file is the original text as the text is meaningful, the file is generally meaningless after being encrypted, and the other steganographic methods such as steganography in video and audio files need multimedia files; and the receiver does not know that the original text undergoes steganography treatment and has a misleading function, and furthermore, the meaning of the disguised text is opposite to the meaning of the original text.

Description

technical field [0001] The invention belongs to the field of information security and relates to a text steganography method based on keyword replacement. Background technique [0002] Steganography (steganography, steganography) is a technique and science about information hiding. The so-called information hiding (information hiding) refers to not letting anyone except the intended recipient know the transmission event or information. content. Modern steganographic technology mainly relies on hiding information in large-capacity files such as images, audios, and videos. There is also a special information hiding technology, which is the subliminal channel proposed by Simmons in 1983. In the narrow sense, the subliminal channel mainly uses digital signatures to hide messages, but the subliminal channel can be closed and digital signatures are used. The transmitted subliminal messages tend to be short. It can be seen that the current information hiding technology either ne...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the shortcomings of the existing steganographic method, which has large redundancy and relies on image and voice data, and provides a method for steganographic text, which can have the function of misleading