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• MODELING OF SECURITY THREATS FOR BUILDING A COMPREHENSIVE INFORMATION PROTECTION SYSTEM AT OBJECT OF INFORMATIZATION

  I. А. Eremin , А.Е. Yakushina , I.L. Shcherbov

  41-54

  2025-07-24

  Abstract ▼

  Within the framework of this study, the typical structure of the informatization facility was analyzed in detail, which allowed qualified specialists to better understand the mechanisms and aspects through which various categories of objects and subjects of information processing that may be subject to security threats. The main mechanism for building a comprehensive information security system is the threat model. This model is aimed at identifying and identifying potential threats, their subsequent analysis and minimizing the risks of their implementation associated with damage to the informatization facility. In the framework of this study, the domestic FSTEC knowledge base and the international ATT&CK and CAPEC knowledge bases are considered to build a threat model. They contain comprehensive information about the tactics and techniques used by intruders in carrying out attacks on informatization facilities. In the course of the research, various tactics used by the attackers were classified in detail. Special attention was paid to the definition of the main tactics that determine the entry points of the informatization object, which are used to further carry out the attack. In the context of developing an effective threat model, it seems advisable to conduct a comprehensive analysis of the data contained in knowledge bases and their subsequent joint use in the process of building a threat model at informatization facilities. This approach makes it possible to systematize and structure information, which contributes to a more accurate and reasonable construction of a model for the implementation of potential threats at different stages of an attack on an informatization facility. To build a comprehensive information security system, a decision support system was considered. The analysis of modern scientific research devoted to the applied methods in the construction of support systems is carried out. As a result of the work, the relationship between knowledge bases of tactics and techniques, as well as well-known vulnerabilities, was shown using the ontology method, which allows us to build a model of a complex threat attack, and identify the targets affected by an attacker at various stages of a complex attack, the criticality of the vulnerability used and the platform on which this vulnerability is implemented, and the definition of negative consequences

• RESEARCH OF METHODS FOR EXAMINATION OF THE SIGNIFICANCE OF THE SMOOTHING POLYNOMIAL COEFFICIENTS

  I.L. Shcherbov

  2023-08-14

  Abstract ▼

  The aim of the work is to study the procedure for checking the significance of the coefficients
  of the smoothing polynomial based on the criteria for testing statistical hypotheses in order
  to form a vector of coefficients of the smoothing polynomial. The developed methods of nonlinear
  adaptive smoothing with optimization of the degree of the smoothing polynomial with optimization
  of the structure of the smoothing polynomial were studied. The study was carried out by simulating
  the value of secondary coordinates, which, according to the formulas of simple methods, were
  converted into primary coordinates, taking into account the location and type of measuring instruments.
  Then, the values of measurement errors distributed according to the normal law were
  added to the obtained values of the primary coordinates. The primary measurement data thus obtained
  were subjected to nonlinear adaptive smoothing. The formation of the coefficient vector of
  the smoothing polynomial was carried out on the basis of the criteria for testing statistical hypotheses
  in the following sequence: formation of the corresponding statistics according to the measurement
  data; comparison of these statistics with a threshold level depending on the confidence
  level and the number of degrees of freedom; making a decision on the inclusion of this component
  in the polynomial. The formation of the coefficient vector of the smoothing polynomial was carried
  out on the basis of the Fisher criterion. Based on the results of the study, the following conclusions
  can be drawn: methods of nonlinear adaptive smoothing with optimization of the structure of the
  smoothing polynomial are superior in terms of quality and efficiency to the method with optimization
  of the degree of the smoothing polynomial; the method of non-linear adaptive smoothing with
  optimization of the structure of the smoothing polynomial Structure 1 is superior in terms of quality
  and efficiency to the method with optimization of the structure of the smoothing polynomial
  Structure 2; The greatest gains in quality and efficiency for all the studied methods are achieved in
  the middle part within 3/5 of the smoothing interval; for all the studied methods, the quality and
  efficiency indicators decrease at the edges of the smoothing interval

• STUDY OF THE AREA OF DETERMINATION OF PARAMETERS OF THE BASIS FUNCTION OF TWO ARGUMENTS IN CONSTRUCTING THE Λ-ORTHOGONAL BASIS FUNCTION

  I.L. Shcherbov

  2023-02-27

  Abstract ▼

  The purpose of the research is to determine the area of setting the argument τ and its discretization
  intervals when constructing an algorithm for adaptive nonlinear
  optimal smoothing of multi-parameter data of trajectory measurements, which makes it possible to
  jointly implement the spatial and temporal redundancy of the data obtained. The research was
  carried out by constructing a Λ-orthogonal basis function in order to obtain independent estimates
  for the coefficients of the smoothing polynomial. It is shown that it is advisable to solve the problem
  of determining the maximum likelihood estimate of the coefficient vector of the smoothing
  polynomial by the method of successive approximations. When constructing a Λ-orthogonal basis
  function, the maximum likelihood estimate of the coefficient vector of the smoothing polynomial is
  achieved in 2-3 iterations. It follows from the research results presented in the paper that the accuracy
  index Qт as a function of two arguments ( is the smallest value of the argument and Δτ is
  the discretization interval of the argument τ) in a wide range of values of these arguments changes
  slightly, but increases sharply at . In this case, the values of these arguments should not
  exceed, respectively, the maximum and minimum possible numbers that can be written without loss
  of accuracy in the re grid of the computer used. With a uniform discretization step of the argument τ it is advisable to choose the argument in the middle part of the interval¸where and
  respectively, are the minimum and maximum numbers that can be written into the bit grid of a
  computer without loss of accuracy. In case of adverse conditions Approaching the edges of the
  interval can lead to an increase in calculation errors in determining the secondary parameters of
  the position of the aircraft due to the fact that the main matrix of the system of equations becomes
  ill-conditioned.