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Network Flow Model

The purpose of this network flow model (NFM) is to assist in providing security for network-attached computing systems. Within the NFM, security is viewed as preventing unwanted information flow between a protected entity (or entities) and everything else. The NFM will allow specific assertions, automated reasoning and formal conclusions about the state of security and what actions are needed to make something secure. The model defines the elements of information that are both necessary and sufficient to describe and reason about the security status of a node and network of nodes. The Network Flow Model slightly refines Ford''s basic architectural levels of security, and adds flow reference points between the layers. The flow reference points are places where one may make assertions about the desired and/or actual information allowed through the reference point. Conceptually, there is a filter at each reference point that allows or denies PDUs to be passed on to the next higher layer.