Serial Model for Attack Tree Computations
In this paper we extend the standard attack tree model by introducing temporal order to the attacker’s decision making process. This will allow us to model the attacker’s behaviour more accurately, since this way it is possible to study his actions related to dropping some of the elementary attacks due to them becoming obsolete based on the previous success/failure results. We propose an efficient algorithm for computing the attacker’s expected outcome based on the given order of the elementary attacks and discuss the pros and cons of considering general rooted directed acyclic graphs instead of plain trees as the foundations for attack modelling.
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