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Supervision des réseaux pair à pair structurés appliquée à la sécurité des contenus

Abstract : The purpose of this thesis is to design and implement new monitoring solutions which are able to deal with the security issues affecting data stored in large structured P2P networks (DHT). There are two major types of issues. First, P2P networks are used to spread illegal contents whose activity is difficult to monitor accurately. Second, the indexation of regular contents can be corrupted (Sybil attack). We first designed a new approach to monitor contents based on the insertion of distributed probes in the network to take control of the indexation mechanism. The probes can attract all the related requests for a given content and assess the peers intent to access it by generating very attractive honeypots. We describe the weaknesses of the network allowing our solution to be effective despite recent protection mechanisms. We then present the services offered by our monitoring architecture and we evaluate its efficiency on KAD. We also present a real deployment whose purpose is to study pedophile contents on this network. Then, we focus on data integrity in distributed hash tables. We performed large scale monitoring campaigns on the KAD network. Our observations show that it suffers from a very harmful pollution of its indexation mechanism affecting 2/3 of the shared files and from a large number of localized attacks targeting contents. To mitigate these threats, we propose a new efficient way to detect attacks by analysing the distribution of the peers' ID found around an entry after a DHT lookup and a counter-measure which can protect the peers at a negligible cost. Finally, we evaluate our solution in real P2P networks.
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https://hal.univ-lorraine.fr/tel-01746173
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Thibault Cholez. Supervision des réseaux pair à pair structurés appliquée à la sécurité des contenus. Autre [cs.OH]. Université Henri Poincaré - Nancy 1, 2011. Français. ⟨NNT : 2011NAN10036⟩. ⟨tel-01746173⟩

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