ВИКОРИСТАННЯ КОЛІРНОЇ МОДЕЛІ RGB ТА МЕТОДУ LSB ПРИ СТЕГАНОГРАФІЧНОМУ ЗАХИСТІ ІНФОРМАЦІЇ У ФАЙЛАХ ФОРМАТУ OFFICE OPEN XML

Анотація

This article represents some aspects of steganographic information protection. The article focuses on an overview of existing methods of hiding information, especially that allow you to embed hidden data into a text file. To create a software tool, the authors chose the LSB method. The preferred method uses the RGB color model for effectively hiding information in the OFFICE OPEN XML format files.

The principle of the LSB method (Least Significant Bit) is replacing the least significant bits of the container (audio, video file, image or text file) with the bits of the message. The possibilities of the human eye are limited in distinguishing the shades of the same color. That is why this substitution is imperceptible to the human.

This method can be used while developing an algorithm for embedding secret data into a container. We have a hidden message in the *.docx document. The document isn’t empty. The amount of data that we can fulfill depends on the amount of the information. The more text the report contains, the more data we can hide there. We add the data itself to the RGB color channels of each text character from the file. First, we need extract from the Word document all the necessary data. The text and information about the colors of each character in the RGB format. Then the resulting color components need to be converted into a binary number system and replace the younger bits of the component colors with the bits of our message.

The software tool that implements the described algorithm is developed at the Department of «Software Systems» of theDneprovskiyStateTechnicalUniversity. Also, it is created its own docx documents parser that fully satisfies the requirements of the task and contains only the necessary functions, such as reading text with preservation of formatting, reading the color of the characters used in the file, etc.