Ontology type: schema:ScholarlyArticle Open Access: True
2016-09
AUTHORS ABSTRACTWe focus on the problem of detecting clients that attempt to exhaust server resources by flooding a service with protocol-compliant HTTP requests. Attacks are usually coordinated by an entity that controls many clients. Modeling the application as a structured-prediction problem allows the prediction model to jointly classify a multitude of clients based on their cohesion of otherwise inconspicuous features. Since the resulting output space is too vast to search exhaustively, we employ greedy search and techniques in which a parametric controller guides the search. We apply a known method that sequentially learns the controller and the structured-prediction model. We then derive an online policy-gradient method that finds the parameters of the controller and of the structured-prediction model in a joint optimization problem; we obtain a convergence guarantee for the latter method. We evaluate and compare the various methods based on a large collection of traffic data of a web-hosting service. More... »
PAGES385-410
http://scigraph.springernature.com/pub.10.1007/s10994-016-5581-9
DOIhttp://dx.doi.org/10.1007/s10994-016-5581-9
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