Text information hiding method and system

Abstract

The invention discloses a text information hiding method and system. The method comprises the steps of associating a BIG5 code of a corresponding space with a basic operator in a binary system; associating the BIG5 code of the corresponding space with another basic operator in the binary system; binarizing to-be-hidden information to obtain a corresponding binary sequence; scanning contents of a carrier document in sequence to obtain space characters in the carrier document; according to a position sequence of the space characters, associating the basic operators in the binary sequence with the space characters one by one; and replacing the space characters with the BIG5 codes corresponding to the basic operators corresponding to the space characters. The universality is high, and visual difference is not caused; a good text information hiding effect is achieved, and especially for English documents with relatively numerous spaces, very large information hiding space is provided.

Description

technical field [0001] The invention relates to the technical field of information hiding, in particular to a text information hiding method and system thereof. Background technique [0002] Text hiding is to hide invisible information in visible text, so that some confidential information can be delivered by hiding in visible text. [0003] Common text hiding methods include: information hiding based on font size shape, information hiding based on character spacing or line spacing, information hiding based on web page html symbols, information hiding based on synonymous word replacement, etc. [0004] There are some defects in these methods. For example, information hiding based on font size, using a font to represent the information bit "0", and another font to represent the information bit "1", this can only be used in text editors that support fonts such as word and pdf implementation, and to achieve visual consistency, two very similar font libraries need to be install...

AI Technical Summary

Problems solved by technology

[0004] There are some defects in these methods. For example, information hiding based on font size, using a font to represent the information bit "0", and another font to represent the information bit "1", this can only be used in text editors that support fonts such as word and pdf implementation, and to achieve visual consistency, two very similar font libraries need to be installed, and such very similar font libraries are generally not included by default in document editors; based on the hiding method of character spacing or line spacing, The information is hidden by different spacing, but this will cause the text to be misaligned, and the visual effect is very unnatural; the information hiding based on html symbols is easier to read because some symbols are used to explicitly replace the information bits 0 and 1 The authors recognized that, based on the synonym replacement method, the difficulty of recovering hidden information is relatively large.

[0005] Therefore, some people have proposed a method based on document character encoding transformation to hide information. For example, in the Chinese patent document whose publication number is CN104699661A, it is proposed to hide information by inserting information into reserved characters in Unicode encoding. This method is due to Changed the encoding content, so there may be garbled characters in some text editors; in the Chinese patent document with the publication number CN101645061, a method of custom encoding is proposed, which lacks versatility. On the computer, the document will not be displayed correctly

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