University of Toronto, 2007.
Denial of Service (DoS) attacks continue to plague traditional Internet services despite ongoing defensive eorts and should be expected to aect novel Internet services and infrastructures as well. This thesis represents one of the rst eorts to provide a detailed study of DoS issues in Content-based Publish/Subscribe (CPS) systems, which can provide the expressive and loosely-coupled messaging services needed by many applications. In this thesis, we highlight several fundamental DoS issues through a number of experiments performed using a general-purpose middleware implementation and also structure the DoS research space with a taxonomy of DoS attack characteristics. Based on the results of this work, we pursue potential solutions for DoS resilience and DoS prevention in detail. First, we develop a model for content-based matching optimizations based on subscription commonalities. And second, we develop a policy framework that allows applications to specify both expressive security and CPS semantic policies.
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