Abstract
Al Qaeda’s network structure before the tragic events of 9/11/2001 is studied using a method of social network analysis. The method is based on a modeling framework to assess the influence of a node in a complex network with respect to spreading information via different paths between source and target nodes. The same framework is used consistently to compute closeness and betweenness centrality measures as well as to detect subcommunities. Centrality measures taking into account all possible paths between source and target nodes, not just the shortest paths, are useful in modeling resilience of covert networks. Along these lines, new versions of node and link betweenness centrality measures are proposed.
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