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Abstract. An ad hoc network is a collection of wireless mobile hosts forming a temporary network without the aid of any established infrastructure or centralized administration. This flexibility in space and time induces new challenges towards the security infrastructure needed to support secure unicast and multicast communications. Especially, traditional group key management architectures meant for wired networks are not appropriate in such environment due to high dynamics and mobility of nodes. In this paper, we propose an enhanced hybrid key management protocol for secure multicast dedicated to operate in ad hoc networks. Built on a protocol called BAAL dedicated to key distribution in wired networks, our approach integrates threshold cryptography and the services of the AKMP protocol to deliver fast, efficient and mobility aware key distribution in a multicast service.

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Securing multicast communications in ad hoc networks must consider several challenging factors such as high nodes mobility, limited bandwidth and constrained energy. Moreover, the establishment of a key management protocol within ad hoc environments meets the "1 affects n" problem, which is more critical in such type of networks, due to the high dynamicity of groups. In this paper, we present an efficient clustering scheme for multicast key distribution in Mobile ad hoc networks. This scheme divides the multicast group into clusters, according to the localization of the group members and their mobility. Simulations indicate a valuable reduction in the average latency of keys distribution and a promising reduction in energy consumption. Analysis also shows that our scheme is scalable.

Several sensitive applications deployed within wireless networks require group communications. A high level of security is often required in such applications, like military or public security applications. The most suitable solution to ensure security in these services is the deployment of a group key management protocol, adapted to the characteristics of MANETS, especially to mobility of nodes.In this paper, we present the ogcY (Optimized Multicast Cluster Tree) algorithm for dynamic clustering of multicast group, that takes into account both nodes localization and mob# lity, and optimizes the energy and bandwidth consumptions. Then, we show how we integrate OMCT within our group key management protocol BALADE, in a sequential multi-source model. The integration Of BALADE and OMCT allows an efficient and fast key distribution process, validated through simulations, by applying various models of mobility (individual mobility and group mobility). The impact of the mobility model on the performance and the behaviour of the group key management protocol BALADE coupled with OMCT, is also evaluated. PRISE EN COMPTE DE LA MOBILITI~ POUR LA GESTION DE CLIPS DE GROUPE DANS LES Rl~SEAUX MOBILES AD HOC R6sum~Plusieurs applications sensibles cibl6es dans les r~seaux ad hoc, requibrent des communications de groupe. Un niveau de s6curit6 6levd est souvent indispensable pour de telles applications, comme les applications de s6curit6 militaires ou publiques. La solution la plus appropri6e pour assurer la s~curit6 de ces services est le d6ploiement d'un protocole de gestion de cl6 de groupe, qui doit ~tre adaptd aux caract6ristiques des MANETS (Mobile Ad Hoc Networks), et notamment d la mobilit~ des noeuds. Dans cet article, nous pr6sentons l'algorithme OMCT (Optimized Multicast Cluster Tree) de clusterisation dynamique du groupe multicast, tenant compte de la localisation et de la mobilit~ des noeuds, et optimisant la consommation de l'~nergie et de la bande passante. Nous montrons comment OMCT est intdgr6 dans notre protocole de gestion de clds BALADE, * MADYNES LORIA --Campus scientifique, B.P. {bouassid, ichris, festor} @loria.fr 1/23 239, 54506 Vandeeuvre-l~s-Nancy Cedex, France; ANN. Tr~LI~COMMUN., 61, n ° 9-10, 2006 1150 M.S. BOUASSIDA -MOBILITY-AWARENESS IN GROUP KEY MANAGEMENT PROTOCOLS WITHIN MANETS dans un cadre multi-sources sdquentielles. Le couplage de BALADE et OMCT permet d'assurer une distribution de clgs efficace et rapide, et est validd au travers de simulations, utilisant diffdrents modules de mobilitg (mobilitd individuetle et mobilitd de groupe). L'impaet du modkle de mobilit¢ sur les performances et le comportement du couplage BALADE et OMCT, est aussi ¢valug