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1 MADYNES - Management of dynamic networks and services INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications 2 FSTC - Faculté des Sciences, de la Technologie et de la Communication

Abstract : This paper addresses the fingerprinting of devices that speak a common, yet unknown to the fingerprinting engine, protocol. We consider a behavioral approach, where the fingerprinting of an unknown protocol is based on detecting and exploiting differences in the observed behavior from two or more devices. Our approach assumes zero knowledge about the syntax and state machine underlying the protocol. The main contribution of this paper consists in a two phased method. The first phase identifies the different message types using an unsupervised support vector clustering algorithm. The second phase is leveraging recent advances in tree support kernel in order to learn and differentiate different implementations of that protocol. The key idea is to represent behavior in terms of trees and learn the distinctive subtrees that are specific to one particular device. Our solution is passive and does not assume active and stimulus triggered behavior templates. We instantiate our solution to the particular case of a VoIP specific protocol SIP and validate it using extensive data sets collected on a large size VoIP testbed.

Keywords : fingerprinting support vector clustering VoIP protocol reverse engineering

Autor: Jérôme François - Humberto Abdelnur - Radu State - Olivier Festor -



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