Smirnov A. Methods and tools of digital steganography using sophisticated digital signals for protection of information resources

The dissertation devoted to the solution of important scientific and applied problems, which is to develop methods and tools of digital steganography with the use of complex discrete signals and direct spread spectrum technology for protecting information resources. During the first research generated additional restrictions on the correlation properties of digital signals in the construction of steganographic information security. Developed by steganographic methods to protect information from adaptive formation of discrete signals, which take into account statistical properties of container used. The proposed information technology key exchange and data transmission in closed stehanosystemi, which takes into account the adaptive (to the statistical properties of the data container) forming discrete signals and allows, thanks to the preservation of secrets from the enemy's secret rule extracting information messages, hide the fact data transfer and thus provide construction secure steganographic security in telecommunication systems and networks. Developed methods the synthesis of large ensembles of discrete signals with multi function auto and cross correlation are different from known procedures using the developed cross the orbits of the group code that allows you to create pseudorandom sequence of discrete, side discharge correlation functions which are finite predetermined value. Further developed mathematical model of steganographic information security systems, characterized by the use of known information-theoretic approach to the definition of abstract procedures stehanoencoding and decoding mappings in the form of appropriate sets of containers, information and data stehanohram, allowing to formalize stehanoconversion for different classes of systems (robust, brittle and fragile semi), and introduce the concept not theoretically detected (completely resistant) stehanosystem formulate necessary and sufficient conditions for their construction. Improved methods of digital steganography, which differ from the known large ensembles generated using digital signals with special correlation properties that can improve the throughput stehano channels with the required safety parameters (stenographic stability) and the probability of data hiding, no critical distortion applied stehano containers. The ob-tained scientific results together constitute the theoretical basis for constructing steganographic data protection using complex digital signals and direct spread spectrum technology for of ensuring information security of state.