Abstract
Abstract In this paper, the method of modeling attack using attack tree is researched. The main goal is effectively using attack tree to model and express multi-stage network attacks. We expand and improve the traditional attack tree. The attack nodes in traditional attack tree are redefined, and the attack risk of leaf node is quantified. On those basis, the mentality and method of building MLL-AT (Multi-Level & Layer Attack Tree) are proposed. The improved attack tree can model attack more accurately, in particular to multi-stage network attacks. And the new model can also be used to evaluate system's risk, to distinguish between varying system security threat degrees caused by different attack sequences.
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