UKRAINE Given the current trends in the development of information technology, there is an urgent need to ensure the security of data and, accordingly, information, is becoming increasingly aggravated in today's realities [1]. Taking into account the previous studies [1][2][3][4], it can be argued that the compilation of formal models requires significant costs and the involvement of highly qualified specialists, they are difficult to understand and require a certain interpretation for

more »

... on in real systems. However, they are necessary and used quite widely, since only with their help it is possible to prove the safety of the system, while relying on the objective and irrefutable postulates of mathematical theory. By their purpose, they are similar, for example, to aerodynamic models of aircraft or models of buoyancy of ships: both of them allow to substantiate the viability of the system and determine the basic principles of its architecture and technological solutions used in its construction. The connection between the above directions of the theory of information security can be represented in the form of the following diagram (Fig. 1) . Fig 1. Directions of development of the theory of information security