Study On Information Hiding Techniques Based On Word Text Document

The information hiding technique can hide the content and existing of information, and it is an important method to insure the computer network information security. It is becoming one of hot research topics in information security field. In recent years,either inside or outside nations,there are a great progress in the information hiding method research, but the technique research based on text is limited.These technique research have not yet resolved the problem of how to increase the information hiding capacity.In this paper, firstly, the development, a model of the system, the basic principles, characteristics and requirement, the classification of the algorithms of informantion hiding are analyzed. Some typical coding methods for text information hiding are especially introduced and analyzed.The characteristics of Word text document and the vision of human are analyzed. Secondly, the information hiding algorithm based on modifying the size of the characters is improved by using zooming the characters tinily. This algorithm can embed 2 bit data into every character of source document. Thirdly, by applying the thoughts of color feature coding, the information hiding algorithm based on modifying the value of character gray is improved by replacing the low bit of RGB value of character. This algorithm can get more information hiding capacity.About 12 bit data can be embeded into every character of source document. Finally, according to the characteristics of Word document, the information hiding algorithm on modifying the RGB value of the character underline in the Word text document is designed by using redundant information of the character underline gray. This algorithm can not only be realized by blind detection,but also get more efficient imperceptibility and information hiding capacity. About 24 bit data can be embeded into every character of source document.