Analysis of the Benefits and Efficacy of the Addition of Variants and Reality Paths to the Blackboard Architecture

While the Blackboard Architecture has been in use since the 1980s, it has recently been proposed for modeling computer networks to assess their security. To do this, it must account for complex network attack patterns involving multiple attack routes and possible mid-attack system state changes. This paper proposes a data structure which can be used to model paths from an ingress point to a given egress point in Blackboard Architecture-modeled computer networks. It is designed to contain the pertinent information required for a systematic traversal through a changing network. This structure, called a reality path, represents a single potential pathway through the network with a given set of facts in a particular sequence of states. Another structure, called variants, is used during traversal of nodes (called containers) modeled in the network. The two structures - reality paths and variants - facilitate the use of a traversal algorithm, which will find all possible attack paths in Blackboard Architecture-modeled networks. This paper introduces and assesses the efficacy of variants and reality paths