Publications de Levente Buttyan

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The deployment of vehicular communication (VC) systems is strongly dependent on their security and privacy features. In this paper, we propose a security architecture for VC. The primary objectives of the architecture include the management of identities a ...

Terminodes are personal devices that provide functionality of both the terminals and the nodes of the network. A network of terminodes is an autonomous, fully self-organized, wireless network, independent of any infrastructure. It must be able to scale up to millions of units, without any fixed backbone or server. In this paper we present the main challenges and discuss the main technical directions.

So far, research on mobile ad hoc networks has been focused primarily on routing issues. Security, on the other hand, has been given a lower priority. This paper provides an overview of security problems for mobile ad hoc networks, distinguishing the threats on basic mechanisms and on security mechanisms. It then describes our solution to protect the security mechanisms. The original features of this solution include that (i) it is fully decentralized and (ii) all nodes are assigned equivalent roles.

In this paper, we analyse the authentication protocol that has been proposed for the so-called global mobility network in the October 1997 issue of the IEEE Journal on Selected Areas in Communications. Using a simple logic of authentication, we show that the protocol has flaws and we present three different attacks that exploit these. We correct the protocol using a simple design tool that we have developed.

The article presents the first results of the CrySTINA project. We analyze and structure the security problem domain in the TINA-C architecture and present our approach to provide the necessary security functionality in the form of self-contained application-independent security services and security mechanisms as part of the DPE functionality. The DPE is assumed to be basically provided by CORBA products. Therefore, we introduce the CORBA security specification and investigate if and how the identified TIN

In mobile ad hoc networks, it is usually assumed that all the nodes belong to the same authority; therefore, they are expected to cooperate in order to support the basic functions of the network such as routing. In this paper, we consider the case in which each node is its own authority and tries to maximize the benefits it gets from the network. In order to stimulate cooperation, we introduce a virtual currency and detail the way it can be protected against theft and forgery. We show that this mechanism fu

In military and rescue applications of mobile ad hoc networks, all the nodes belong to the same authority; therefore, they are motivated to cooperate in order to support the basic functions of the network. In this paper, we consider the case when each node is its own authority and tries to maximize the benefits it gets from the network. More precisely, we assume that the nodes are not willing to forward packets for the benefit of other nodes. This problem may arise in civilian applications of mobile ad hoc

We propose a new approach to securing self-organized mobile ad hoc networks. In this approach, security is achieved in a fully self-organized manner

To be provided later.

Micropayment schemes usually do not provide fairness, which means that either the payer or the payee, or both, can cheat the other and gain a financial advantage by misbehaving in the protocols. We propose an extension to a family of micropayment schemes that removes the financial incentive to cheat. Our extension does not provide true fairness, but it makes misbehaving practically futile for both the payer and the payee. We achieve this without any substantial loss in efficiency, in most practical cases.

Levente Buttyan

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Architecture for Secure and Private Vehicular Communications

Towards Mobile Ad-Hoc WANs: Terminodes

The Quest for Security in Mobile Ad Hoc Networks

A Note on an Authentication Technique Based on Distributed Security Management for the Global Mobility Network

Security in the Telecommunication Information Networking Architecture - the CrySTINA Approach

Nuglets: a Virtual Currency to Stimulate Cooperation in Self-Organized Mobile Ad Hoc Networks

Stimulating Cooperation in Self-Organizing Mobile Ad Hoc Networks

Report on a Working Session on Security in Wireless Ad Hoc Networks

Small Worlds in Security Systems: an Analysis of the PGP Certificate Graph

A Pessimistic Approach to Trust in Mobile Agent Platforms

Removing the financial incentive to cheat in micropayment schemes

Non-Cooperative Behavior in Networking (Guest Editorial)