PUBLICATION: Sécurité, protection de la vie privée et disponibilité
© OFTA. Personal use of this material is permitted. The definitive version of this paper was published in Book chapter N°12 in "Informatique Diffuse", Observatoire Francais des Techniques Avancees, Collection Arago 31, Paris, Mai 2007, ISBN: 2-906028-17-7 and is available at :