THE METHOD OF PHASIFICATION OF INTERVALS FOR SOLVING CYBERSECURITY ASSESSMENT TASKS AT CRITICAL INFRASTRUCTURE FACILITIES

Abstract

One of the new and promising approaches to solving the problem of cybersecurity assessment at critical infrastructure facilities is the use of fuzzy sets theory, for example, to assess information security risks. In practice, there are situations when the calculation of the final results is significantly affected by inconsistencies in opinions or errors of experts. Therefore, to minimize such errors, we propose methods for phasing intervals by converting them into fuzzy numbers (FNs). The method allows for the flexibility and efficiency of such a process of transforming intervals and minimizes the influence of the human factor. There are known methods for converting intervals into triangular and trapezoidal fuzzy numbers, but they do not always give an acceptable result. Therefore, a new method of fuzzification is proposed, which, by implementing procedures for determining the coefficient of convergence and forming the medians of intervals, determining the shift parameter and stretching coefficient, as well as the procedure for forming standards, allows for the flexibility of the conversion process to obtain triangular and trapezoidal FNs that reflect the values of the original intervals. The developed method can be effectively used to solve cybersecurity assessment problems at critical infrastructure facilities.