Lukova-Chuiko N. Methodological bases for ensuring the functional stability of distributed information systems to cyber threats

In the dissertation the actual scientific and applied problem of working out of methodological bases for ensuring the functional stability of distributed information systems to cyber threats is solved. The proposed problem is solved by the development of theoretical and methodological foundations for the creation of information technology aimed for ensuring the functional stability of distributed information systems to cyber threats. The methodological bases for ensuring the functional stability of distributed information systems to cyber threats are developed, which is based on the interrelated set of models and methods based on a structured representation of performance indicators and indicators of cyber influences. This provides the ability to build information systems with technological properties to detect and block cyber effects in a timely manner. The complex of analytical models and methods for monitoring the operation of distributed information systems and the interaction of agents in the assessment of the state of distributed information system is developed. This complex takes into account time, information and structural indicators and criteria, which makes it possible to ensure the stability of the functioning of distributed information systems to cyber influences. The method of functioning of agents for detecting and blocking harmful cyber influences on the operation process is improved, which effectively protects the distributed information system both from attacking throughout the time interval and from slow attacks. This method is based on the using of DDoS-attack detection and blocking models, as well as the collection of information about incoming traffic with a record in the database.