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Expected Cost Analysis of Attack-Defense Trees

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Quantitative Evaluation of Systems (QEST 2019)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 11785))

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Abstract

Attack-defense trees ( ) are an established formalism for assessing system security. We extend with costs and success probabilities of basic events. We design a framework to analyze the probability of a successful attack/defense, its expected cost, and its probability for a given maximum cost. On the conceptual level, we show that a proper analysis requires to model the problem using sequential decision making and non-tree structures, in contrast to classical analysis. On the technical level, we provide three algorithms: (i) reduction to PRISM-games, (ii) dedicated game solution utilizing the structure of the problem, and (iii) direct analysis of for certain settings. We demonstrate the framework and compare the solutions on several examples.

This research was funded in part by the Studienstiftung des deutschen Volkes project “Formal methods for analysis of attack-defence diagrams” and the German Research Foundation (DFG) project KR 4890/2-1 “Statistical Unbounded Verification”.

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Notes

  1. 1.

    https://www.owasp.org/index.php/CISO_AppSec_Guide:_Criteria_for_Managing_Application_Security_Risks.

  2. 2.

    https://www.sto.nato.int/publications/STO%20Technical%20Reports/RTO-TR-IST-049/%5Cprotect%20%5CT1%5Ctextdollar%20%5Cprotect%20%5CT1%5Ctextdollar%20TR-IST-049-ALL.pdf.

  3. 3.

    https://www.fireeye.com/current-threats/annual-threat-report.html.

  4. 4.

    Since a step in the analysis transforms the trees into DAGs, we already introduce more generally as a DAG, not necessarily a tree.

  5. 5.

    To simplify the presentation, we do not consider infinite executions since the games we deal with in this paper are finite and acyclic. Nevertheless, the theory would seamlessly extend to games with cycles and infinite executions if the need of such gates, e.g. [18], arises.

  6. 6.

    In general, one can consider randomizing history-dependent strategies. However, in the context of our paper, positional strategies are sufficient even for cost-bounded objectives since the costs will be implicitly encoded in the states of the games.

  7. 7.

    In principal, a basic event can be triggered by several events and is triggered as soon as one of these events is completed successfully, which is equivalent to a disjunction over all these triggers.

  8. 8.

    http://jscience.org/.

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Correspondence to Julia Eisentraut .

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Eisentraut, J., Křetínský, J. (2019). Expected Cost Analysis of Attack-Defense Trees. In: Parker, D., Wolf, V. (eds) Quantitative Evaluation of Systems. QEST 2019. Lecture Notes in Computer Science(), vol 11785. Springer, Cham. https://doi.org/10.1007/978-3-030-30281-8_12

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