A Model of Network Porosity
MASSACHUSETTS INST OF TECH LEXINGTON LEXINGTON United States
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Compartmentalization is one of the standard mechanisms used by defenders to secure enterprise networks. Unfortunately, the compartmentalization process from a security standpoint currently remains more of an art than a science. Even when this art is well executed, the ongoing evolution of the network often violates initial, security-critical design assumptions. Toward improving operational security, MIT Lincoln Laboratory has a collection of metrics which can be used to continuously assess risk within the context of cyber security. One important security metric in this collection is a measure for managing network boundaries and filters or network porosity. This metric computes the risk inherent to a given network architecture. This technical report describes the model that underlies the network porosity metric and a simulation implementing the model.
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