Models for Assessing the Security of Network Information Systems against Negative External Influences

The structure of an intelligent information system that has been designed to protect the network information system from unauthorized external influences by various parrying means is described. The conditions for the stable functioning of the network information system are presented. An optimization problem has been formulated, which consists in the need to minimize the negative external influence on the network information system using parrying means of the designed intelligent information system. This problem has been divided into four subproblems, analytical models have been created for their solution, algorithms have been developed, and two examples of analytical solutions of problems of optimal distribution of negative external influences by the elements of the network information system without taking the mutual influence of system elements into account and taking them into account are shown.