Industrial Automatic Control Systems and Controllers Annotation << Back Formation of Information Security Systems of High Reliability in Terms of the Probability of Failure-free Operation of Their Constituent Elements V.V. Kadomkin, S.I. Zhuravlev, N.T. Kunin The paper considers the methodology of forming an information security system of high reliability, taking into account the values of the probability of failure-free operation of the components, which allows ensuring its constant high operational readiness to perform its functions during the entire period of operation by users and technical support by developers. Keywords: information security system; system reliability; failure flow parameter; probability of failure-free operation; reliability block diagram; operating conditions of the reliability block diagram; minimum value of the probability of failurefree operation of the block; number of the block to be replaced. DOI: 10.25791/asu.10.2021.1320 Pp. 49-54.