Method of forming the system of indicators of information and telecommunication systems vitality

For objective investigation of the properties of survivability of information and telecommunication systems (ITS) as complex technical systems, a qualitative assessment of these properties is needed. Each property of ITS should have a quantitative characteristic, which is determined by the respective indicator of vitality. For quantitative characterization of the full list of properties of ITS, it is necessary to create a system of indicators of vitality. The article suggests methodical approaches used to form a system of indicators of survivability of ITS based on the analysis of the conditions of their application, evaluation of factors influencing survivability of the system, and definition of the properties that a system should have in order to perform the required functions. To determine these properties, the paper consideres some conflict situation in which two opposing factions solve the task of achieving a preference for each of them. It was decided that the priority for each of the conflicting sides is the disabling of its functioning in the critical information infrastructure in conditions of intentional damaging effects. No limitation on the means used for defeat is imposed. The analysis of factors affecting vitality of the system defined the properties survivability ITS. To determine the quantitative characteristics of survivability properties, the paper introduces a probability area and on its basis single and comprehensive measures of survivability are offered. The paper provides recommendations for using single and complex indices to design, manufacture, and operate ITS.