Ecole d'ingénieur et centre de recherche en Sciences du numérique

Optimistic fair exchange for secure forwarding

Önen, Melek;Shikfa, Abdullatif;Molva, Refik

SPEUCS 2007, 1st Workshop on the Security and Privacy of Emerging Ubiquitous Communication Systems, August 10, 2007, Philadelphia, USA

Several cooperation enforcement schemes based on rewarding mechanisms such as electronic cash or online credits have lately been proposed to prevent selfish behavior in ad-hoc networks. However, these schemes suffer from the lack of fairness guarantees or the reliance on costly mechanisms such as tamperproof hardware or the requirement for Trusted Third Parties (TTPs) that are not suitable for ad-hoc networks. In this paper, we present a new cooperation-enforcement scheme that is perfectly suitable for ad-hoc delay-tolerant networks. The protocol is based on a simple technique called hotpotato forwarding whereby in order to receive a packet, potential recipients must first deliver an advance reward to the sender prior to the transmission of the packet. Thanks to this technique cooperation among nodes becomes mandatory and poisoning attacks and cheating actions are inherently prevented. The second contribution in our scheme is an optimistic fair exchange protocol that solves the fairness problem that is inherent to peer rewarding schemes. The protocol achieves total fairness with the help of a TTP and is optimistic in that the TTP is only involved in case of conflict between peer nodes. Correct execution of the protocol does not require any access to the TTP, so fairness is achieved without any impact on well-behaving nodes. The fairness of the protocol is validated through the exhaustive analysis of all possible protocol traces.

Document Bibtex

Titre:Optimistic fair exchange for secure forwarding
Type:Conférence
Langue:English
Ville:Philadelphia
Pays:ÉTATS-UNIS
Date:
Département:Sécurité numérique
Eurecom ref:2299
Copyright: © EURECOM. Personal use of this material is permitted. The definitive version of this paper was published in SPEUCS 2007, 1st Workshop on the Security and Privacy of Emerging Ubiquitous Communication Systems, August 10, 2007, Philadelphia, USA and is available at :
Bibtex: @inproceedings{EURECOM+2299, year = {2007}, title = {{O}ptimistic fair exchange for secure forwarding}, author = {{\"{O}}nen, {M}elek and {S}hikfa, {A}bdullatif and {M}olva, {R}efik}, booktitle = {{SPEUCS} 2007, 1st {W}orkshop on the {S}ecurity and {P}rivacy of {E}merging {U}biquitous {C}ommunication {S}ystems, {A}ugust 10, 2007, {P}hiladelphia, {USA}}, address = {{P}hiladelphia, {\'{E}}{TATS}-{UNIS}}, month = {08}, url = {http://www.eurecom.fr/publication/2299} }
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