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Theses

Services AAA dans les réseaux adhoc mobiles

Abstract : Mobility is an important component of people’s liberty. The evolution of technological means contributes to its enhancement. In addition to the transport issue, the question of keeping people connected is, in that context, particularly significant. Technological change strained the notion of telecommunications networks in the sense that scattered or clustered but mobile individuals had to remain in touch with others electronically. From the age of analogue networks to the digital networks era, from wired networks to wireless and mobile networks, technology has never stopped evolving. The last decades have witnessed the emergence of digital and wireless networks where not only the users, but also the network infrastructure to which they contribute, are mobile. These networks are spontaneously formed and autonomously maintained. They are termed Mobile Ad hoc Networks (MANETs), in contradistinction to infrastructure networks. Security is a general concern of human beings. They feel the need for it when using a network, too. This need is particularly glaring when it comes to exchanging critical, financial or strategic data. Confidentiality of communications, source authentication, integrity assurance, prevention of repudiation, are all objectives to be achieved. Various security solutions have been devised in this context as wired networks were then adapted to wireless and mobile networks. AAA (Authentication, Authorization and Accounting) frameworks are among these solutions. They are generally used for commercial purposes, which raises financial issues — and we all know how much important they are. Due to their ease of deployment and inexpensive implementation, MANETs, first used in the military field, seem to have a future in commercial applications. That is why the present thesis proposes to design an AAA service that is adapted to the characteristics of such networks. In this perspective, the thesis examines, to begin with, mobile ad hoc networks in order to understand their characteristics and potentials. It then probes the security solutions that exist in infrastructure networks, with special emphasis on those dealing with access control and AAA services. The AAA solutions for MANETs proposed up to now are subsequently analyzed and classified in order to determine their strengths and weaknesses. This in-depth study led to the design, in the second part of the thesis, of an AAA service that meets the expectations identified. It is a distributed service intended to answer the needs of autonomous operations in MANETs when a nearby operator is absent. It features several detailed authentication and authorization mechanisms and protocols with an authentication protocol simultaneously involving one or more parties. These protocols are designed such that they can be easily integrated to the IPv6 protocols suite. Moreover, their security is discussed — in particular, that of the authentication protocol thanks to a formal validation tool. Unlike the communication mode of the authorization protocols, that of the authentication protocol is one-to-many, which led us to study more deeply its performances thanks to modeling using explicit mathematical computations and to simulations techniques. The obtained results showed that the protocol scales for a MANET including a hundred nodes. Under certain conditions that we explained, its performances, in terms of the probability of authentication success and the length of the executing time, reach optimal values.
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Claire Sondès Larafa. Services AAA dans les réseaux adhoc mobiles. Autre [cs.OH]. Institut National des Télécommunications, 2011. Français. ⟨NNT : 2011TELE0023⟩. ⟨tel-00698490⟩

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