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Annales Des Télécommunications

, Volume 62, Issue 11–12, pp 1353–1364 | Cite as

Threshold signature for distributed time stamping scheme

  • Alexis BonnecazeEmail author
  • Philippe TrebuchetEmail author
Article
  • 68 Downloads

Abstract

The aim of a time-stamping system is to prove the existence of a digital document at a particular time in the past. Implemented time-stamping systems are generally based on a centralized server model. However, the unique server may represent a weakness for the system. In this paper, we propose a distributed time-stamping scheme which is more robust against a denial of service attack. Our protocol is based on a multisignature scheme. In order to be valid, time-stamps need to be accepted by at least X servers. The interesting point is that the size of the time-stamp token does not depend on X and that there is no publication process.

Key words

Computer security Distributed systems e-signature Cryptography Dating 

Signature à Seuil Pour un Système D’horodatage Distribué

Résumé

Le but d’un système d’horodatage est de prouver l’existence d’un document numérique à une date donnée dans le passé. Les implantations de systèmes d’horodatage sont généralement basées sur le modèle monoserveur. Ce modèle peut cependant constituer une faiblesse pour le système. Dans cet article, nous proposons un système d’horodatage distribué qui peut faire face à des attaques par déni de service. La taille du jeton est constante et il n’existe pas de processus de publication. Notre protocole est basé sur un schéma de multisignature courte. Afin d’être valide, le jeton doit être accepté par au moins λ serveurs.

Mots clés

Sécurité informatique Système réparti Signature électronique Cryptographie Datation 

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Copyright information

© Institut Telecom / Springer-Verlag France 2007

Authors and Affiliations

  1. 1.ESIL, département Réseaux et MultimédiaLaboratoire IML, Université de la MéditerranéeMarseille cedex 09France
  2. 2.INRIA, projet SALSALIP6, Université de Paris 6ParisFrance

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