Industrial Automatic Control Systems and Controllers Annotation << Back Method of assessing the functional performance of an infocommunication system under conditions of destructive impacts of cyber-attacks Kochedykov S.S. The functioning of infocommunication systems under the conditions of destructive impacts of cyber attacks imposes strict restrictions on the time of making management decisions on the state of operability of such systems. In connection with the need to solve this problem, the article proposes a new method for assessing the functional operability of an infocommunication system based on the use of the theory of differential calculus. This method, in contrast to the classical method for assessing the reliability and existing mathematical models for assessing the operability of infocommunication systems, differs in that the task of assessing the functional operability of a system under conflict conditions is reduced to fi nding differentiable functions describing the operability of the system. At the same time, it is taken into account that destructive impacts disrupt the structure of the system, strengthening negative connections and weakening positive connections between its components, blocking the operation of the most important components, thereby depriving other components of resource support. The idea of assessing the risk of disruption of the functional operability of an infocommunication system exposed to destructive impacts is that the concept of risk is associated with the concept of the process of maintaining the functional operability of the system. The method proposed in this article allows to reduce the time of decision-making on the operability of an infocommunication system based on the presence of a number of features and does not require simulation modeling of the entire process of functioning of the infocommunication system under conditions of destructive infl uences. Keywords: algorithm, destructive impact, infocommunication system, information security, cyber attack, risk assessment. DOI: 10.25791/asu.7.2025.1597 Pp. 21-31.