MODEL OF STEGANOGRAPHIC SYSTEM BASED ON SPATIAL AND FORMAT PRINCIPLES OF INFORMATION HIDING

Abstract

The actual task of choosing a mathematical model of the steganographic system for hiding information within the network communication infrastructure of Internet participants in the media space is considered. The proposed model is focused on the development and evaluation of the effectiveness of steganographic algorithms for hiding large amounts of information in digital images and the implementation of the function of working with JPEG and BMP formats. It is assumed that the working algorithms of the steganographic system analyze and change the structure of file segments.

In today's world, there are several practical reasons for the practical interest in computer and, above all, digital steganography. In our opinion, this is the presence of such practical problems as: restrictions on the use of cryptographic protection of information in some countries and new technological opportunities for the activities of special services in modern conditions; management of computer incidents and computer forensics, due to the wide technological possibilities for violation of supervision over the actions of users and processes of information and telecommunication systems, which can lead to threats of leakage, imposition, destruction and blocking of information; protection of property rights to information presented in digital form, and development of technologies to protect information from forgery and unauthorized duplication.

Studies have shown that the conversion area is not well suited for the introduction of large amounts of data, but is well suited for the introduction of digital watermarks, which are a limited sequence of bytes. The principal requirement is also the many restrictions imposed on the container. Carrying out of research of features of formats of JPEG-files and ВМР-files allowing to make secret introduction of the information of large volume. In addition, the requirement not to degrade the quality of digital photos is required. The BMP format, compared to the JPEG format, has a large spatial area of the image. JPEG format contains a fairly large set of file structure segments. Some segments are skipped by JPEG file reader software. Writing information in the LSB area of a BMP file makes it possible to implement a large number of bytes of information. Disadvantage - such an implementation is quite easy to detect.