Метод оценки стойкости функций безопасности средств защиты автоматизированной системы управления полетами космических аппаратов

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А.Г. Андреев, Г.В. Казаков, В.В. Корянов
20 Инженерный журнал: наука и инновации # 7·2017
Method for assessing safety functions durability
of the security facility of an automated spacecraft
flight control system
© A.G. Andreev1, G.V. Kazakov1, V.V. Koryanov2
1Federal State Budget Institution the 4th Central Research Institute
of the Ministry of Defence of the Russian Federation,
Korolev town, Moscow Region, 141091, Russia
2Bauman Moscow State Technical University, Moscow, 105005, Russia
A significant number of risk factors affect the automated spacecraft flight control system
(ASFCS). To effectively neutralize these factors, it is necessary to assess the sensitivity
and stability of the information security facility of the ASFCS. For different security clas-
ses of such systems, it is necessary to define basic functional safety indicators. We rely on
the notion of security functions durability, and for its evaluation we introduce strict defi-
nitions of the basic concepts: the mechanism of protection, security facility, reliability of
control, sensitivity and durability of information security facility. For the security coeffi-
cient, which is an indicator of the durability of information security facility, we obtained
an analytical expression. Using the standard model of the threat counteraction process,
we solved the task of determining some tentative values of type 2 error probabilities for
the security facility. Furthermore, we assessed the priorities of the information security
facility, which enabled us to obtain a variational series of type 2 error probability values,
and in certain cases to set the required values of such probabilities of the security facili-
ty. The application of the developed method makes it possible to assess the residual threat
impact on the information resources of the automated spacecraft flight control system. If the
residual risk is acceptable, then the stability of the protection mechanisms meets the require-
ments of the system's safety. Otherwise, it is necessary to use protection mechanisms with the
increased durability.
Keywords: information security, threat localization, protection mechanism, threat neutrali-
zation, threat detection, threat prevention, security facility, durability of control system,
sensitivity of security facility
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