Rabchun A. Methods and models of indices optimization for information security systems in conditions of dynamic informational confrontation

Dissertation is devoted to developing theory and practice of information security systems indices in conditions of dynamic informational confrontation. An aim of the dissertation is increasing of information security efficiency in companies' information systems by optimal using of information security systems resources. Modern methods of information systems security indices optimization were analyzed and classified. It gave possibility to formulate requirements for new and more effective methods of optimization. Tasks as for information security which emerging in informational confrontation between companies were classified. Attacks statistics in the field of commercial companies' information security were reviewed. Mathematical model of company's information security systems in conditions of dynamic informational confrontation was developed. Also recommendations for parameters which form this model and functions selection were given. Modeling process of informational confrontation between companies got farther improvement using operation with informal (fuzzy) notions. Mathematical model was extended on multilevel information security systems. It gives opportunity for optimization of dynamical information security resource distribution between objects with different levels of vulnerability, amount of information and directional property of attacks. Also got farther improvement theory of multilevel information security systems definition in mass attacks conditions which based on Markov's discrete and continuous chains theory. Software complex and user's manual were developed which based on methods which were proposed in this manuscript. Software complex might be used for efficiency analysis of existing and developing information security systems. It gives possibility for minimization company's loses from ineffective management decisions in information security sphere.