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Security index based on perfectly undetectable attacks : Graph-theoretic conditions
-
- Gracy, Sebin (author)
- KTH,Reglerteknik
-
- Milosevic, Jezdimir (author)
- KTH,Reglerteknik
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- Sandberg, Henrik (author)
- KTH,Reglerteknik
- (creator_code:org_t)
- Elsevier BV, 2021
- 2021
- English.
- In: Automatica. - : Elsevier BV. - 0005-1098 .- 1873-2836. ; 134
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The notion of security index quantifies the least effort involved in conducting perfectly undetectable attacks. Thus, the security index enables a systems operator to assess the vulnerability of a component, informs sensor placement strategies, and helps in deciding the feasibility of secure estimators and fault detectors. In this paper, we investigate the (possible) variation in this index as a consequence of variation in the system parameters. To this end, we adopt a structured systems approach, typically represented by a directed graph, with the edges of the said graph being in one-to-one correspondence with the system parameters. We first show that the security index is generic. That is, for almost all choices of edge weights, the security index of a component remains the same. We refer to such an index as the generic security index. Secondly, we derive graph-theoretic conditions (and based on those an algorithm) for computing the generic security index. Third, we provide graph-theoretic conditions for computing lower (resp. upper) bounds on the values that the security index of a component can take for all nonzero choices of the edge weights of the directed graph. Finally, we provide a brute force search method for calculating the said bounds.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
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