The work is devoted to the problem of decision support in the field of information security. The aim of the work is to build (within the framework of the game-theoretic approach) an iterative procedure for determining a mixed game strategy for ensuring information security under the uncertainty of the state of the protected object and countering an intruder. The use of the methodological apparatus of simulation modeling (along with the use of the Brown-Robinson fictitious enactment method) is due to the possible non-Poisson type of event flows leading to a change in the state of the protected object, as well as the complexity of solving stochastic games with three participants. The application of the developed procedure makes it possible to increase the scientific validity of managerial decisions on the choice of protection strategies for stochastically dynamic (changing their state randomly) objects.

Keywords: information security, uncertainty, counteraction, game-theoretic approach, simulation modeling