Efficiency Improving Methods of Transmission of Confidential Information by Public Channels

Abstract

The work is devoted to solving the problem of improving the efficiency of transmission of confidential information by public channels by way developing new and modifying existing steganographic methods and algorithms that are resistant to perturbation by reducing the sensitivity of the task of creating stego. The new steganographic method that provides complete recovery of confidential information in the presence of significant perturbation, which is based on the principle of expanding the spectrum of additional information to the cover data spectrum is developed. Further development got the method of reducing of sensitivity of stego, which created by existing steganographic methods, at the expense of decreasing conditionality number of a task of decoding of confidential information. Its application allowed to increase efficiency of decoding steganographic methods based on use of least significant bit of the cover on the average on 35%. Further development got the general approach to the analysis of a state and technology of functioning of information systems that gave the chance to increase stability of some existing steganographic algorithms by their modification and to carry out the analysis of their stability. Stability to perturbations of new modifications exceeds stability of basic algorithm on the average on 30%.