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To assist rational decision making regarding network security improvements, decision makers need to be able to assess weaknesses in existing or potential new systems. This paper presents a model based assessment framework for analyzing the network security provided by different architectural scenarios. The framework uses a probabilistic relational model to express attack paths and related countermeasures. In this paper, it is demonstrated that this method can be used to support analysis based on architectural models. The approach allows calculating the probability that attacks will succeed given the instantiated architectural scenario.
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