Bertrand Ducourthial

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A Vehicular Ad hoc Network is a collection of mobile hosts forming a temporary network without the aid of any established infrastructure. This flexibility in space and time induces new challenges towards the security needed to support secure communications. Indeed, VANET are subject to attacks due to their vulnerabilities; one of the most compromising(More)
Since few years, Vehicular Ad hoc Networks deserve much attention. The development of wireless communication in VANET implies to take into account the need of security. In VANET, many attacks rely on having the attacker generate multiple identities to simulate multiple nodes: this is called the Sybil attack. In this paper, we propose a precise(More)
Ad hoc networks, particularly around IEEE 802.11 standards, are subject to increasing research interest. For a class of applications, involving terminals with high mobility, the experimentation is sometimes hardly affordable. The simulation is thus essential to explore new communication services. In this paper we explain the modification of ns-2 simulator,(More)
Self-stabilizing protocols can resist transient failures and guarantee system recovery in a nite time. We highlight the connexion between the formalism of self-stabilizing distributed systems and the formalism of generalised path algebra and asynchronous iterations with delay. We use the later to prove that a local condition on locally executed algorithm(More)
The Associative Mesh Model is a new parallel computing model whose basic data movements consist of global operations on data distributed on arbitrary connected components of processing nodes. The graph that de nes these connected components is a dynamically de ned subgraph of the physical interconnection graph, that is a 2 dimensional mesh with diagonals.(More)
In this paper, we present a protocol to collect data within a vehicular ad hoc network (VANET). In spite of the intrinsic dynamic of such network, our protocol simultaneously offers three relevant properties: (1) It allows any vehicle to collect data beyond its direct neighborhood (i.e., vehicles within direct communication range) using vehicle-to-vehicle(More)
Vehicular networks are a class of mobile networks in which vehicles are equipped with radio interfaces and are therefore able to communicate with an infrastructure (if existing) or other vehicles in an opportunistic way. Information dissemination enjoys wide applicability in these types of networks, ranging from traffic information and warnings, to parking(More)
Vehicular networks are drawing a great attention from the research community and the automotive industry, where they are beneficial in providing ITS (Intelligent Transportation System) services as well as assisting the drivers on the road. In this context, vehicular networks are based on V2I (Vehicle to Infrastructure) and V2V (Vehicle to Vehicle)(More)
We propose a group membership service for dynamic ad hoc networks. It maintains as long as possible the existing groups and ensures that each group diameter is always smaller than a constant, fixed according to the application using the groups. The proposed protocol is self-stabilizing and works in dynamic distributed systems. Moreover, it ensures a kind of(More)