Tsmokanych I. Methods and algorithms for protecting information from high-frequency interference.

ABSTRACT Tsmokanych I.V. Methods and algorithms for protecting information from high-frequency interference - Qualifying scientific work on manuscript rights. Dissertation for obtaining the scientific degree of Doctor of Philosophy in specialty 125 - "Cyber Security". - State University of Information and Communication Technologies of the Ministry of Education and Science of Ukraine, Kyiv, 2023. The thesis solves the current scientific and technical task of developing methods and algorithms for protecting information from high-frequency interference. In order to achieve the set goal in the work, it is necessary to solve the following separate research tasks: 1. To analyze the current state of information security against leakage through high-frequency interference channels on objects of information activity and critical infrastructure. 2. To study modern methods and ways of protecting information from leakage through channels of high-frequency imposition. 3. To develop a model of blocking the interception of information, which ensures the destruction of informative parameters of dangerous signals formed by high-frequency imposition. 4. To develop an information protection model that ensures the search for optimal parameters of effective interference protective signals capable of destroying informative parameters of dangerous signals of high-frequency imposition on the fundamental frequency and combinational harmonics of the probing signal. 5. Experimentally verify the reliability of the developed models and the method of information protection against leakage through channels of high-frequency imposition. 6. Develop a model for calculating the information security factor against dangerous high-frequency interference signals 7. Develop a method of protecting information from dangerous high-frequency interference signals. 8. To evaluate the effectiveness of the impact of protective signals on dangerous signals of high-frequency interference, in which the information-entropy criterion of the quality of reception of radio signals is used. The object of the research is the process of protecting information from leakage through channels formed by the method of high-frequency imposition. The subject of research are methods and algorithms for protecting information from high-frequency imposition. Research methods are based on the use of probability theory, parametric identification of systems, spectral estimation, methods of digital signal processing, correlation analysis, mathematical analysis, linear algebra, mathematical and computer modeling, as well as theoretical foundations of statistical radio engineering. Scientific novelty of the obtained results. In the process of theoretical and experimental research and modeling, the following new scientific results were obtained: 1. For the first time, a model of blocking the process of interception of information by channels of high-frequency imposition is proposed, which, based on the process of superposition of harmonic oscillations close in frequency, allows to ensure the effect of "beating" frequencies by destroying the informative parameters of dangerous signals and blocks the leakage of information through channels of high-frequency imposition. 2. The model of information protection against leakage through high-frequency interference channels has been improved, which, unlike the existing ones, is built on the basis of intentional frequency "swinging" and ensures the destruction of the informative parameters of dangerous high-frequency interference signals not only on the main frequency, but also on combination harmonics of a dangerous probing signal. 3. The model for calculating the information security assessment coefficient has been improved, which, unlike the existing ones, is built on the basis of a comparison of the energy components measured in the bands sufficient for interception of dangerous and protective signals and provides a quantitative assessment of security based on the established value of the coefficient, taking into account the parameters and values of the dangerous probing signal. 4. For the first time, a method of protecting information from leakage through high-frequency jamming channels was developed, which is based on the algorithm of blocking and destroying informative parameters of a dangerous high-frequency jamming signal, which ensures information protection according to the given values of the security factor. Practical significance of the obtained results: The proposed models and methods can be used by research and development organizations and state structures in the development and improvement of information security assessment during the instrumental control of various objects of information activity of critical infrastructure and solving complex problems regarding information protection at objects of information activity of critical infrastructure.