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Partitioned group password-based authenticated key exchange

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dc.affiliation.dptoUC3M. Departamento de Matemáticases
dc.contributor.authorFiore, Dario
dc.contributor.authorGonzález Vasco, María Isabel
dc.contributor.authorSoriente, Claudio
dc.date.accessioned2023-12-13T08:04:19Z
dc.date.available2023-12-13T08:04:19Z
dc.date.issued2017-12
dc.description.abstractGroup Password-Based Authenticated Key Exchange (GPAKE) allows a group of users to establish a secret key, as long as all of them share the same password. However, in existing GPAKE protocols as soon as one user runs the protocol with a non-matching password, all the others abort and no key is established. In this paper we seek for a more flexible, yet secure, GPAKE and put forward the notion of partitioned GPAKE. Partitioned GPAKE tolerates users that run the protocol on different passwords. Through a protocol run, any subgroup of users that indeed share a password, establish a session key, factoring out the 'noise' of inputs by users holding different passwords. At the same time any two keys, each established by a different subgroup of users, are pair-wise independent if the corresponding subgroups hold different passwords. We also introduce the notion of password-privacy for partitioned GPAKE, which is a kind of affiliation hiding property, ensuring that an adversary should not be able to tell whether any given set of users share a password. Finally, we propose an efficient instantiation of partitioned GPAKE building on an unforgeable symmetric encryption scheme and a PAKE by Bellare et al. Our proposal is proven secure in the random oracle/ideal cipher model, and requires only two communication rounds.en
dc.format.extent11
dc.identifier.bibliographicCitationFiore, D., González Vasco, M. I., & Soriente, C. (2017). Partitioned Group Password-Based Authenticated Key Exchange. The Computer Journal, 60(12), 1912-1922.en
dc.identifier.doihttps://doi.org/10.1093/comjnl/bxx078
dc.identifier.issn0010-4620
dc.identifier.publicationfirstpage1912
dc.identifier.publicationissue12
dc.identifier.publicationlastpage1922
dc.identifier.publicationtitleThe Computer Journalen
dc.identifier.publicationvolume60
dc.identifier.urihttps://hdl.handle.net/10016/39076
dc.identifier.uxxiAR/0000032343
dc.language.isoengen
dc.publisherOxford Academicen
dc.rights© 2023 Oxford University Press.en
dc.rights.accessRightsopen accessen
dc.subject.ecienciaInformáticaes
dc.subject.ecienciaMatemáticases
dc.subject.ecienciaTelecomunicacioneses
dc.subject.otherGroup Key Exchangeen
dc.subject.otherPassword Authenticationen
dc.subject.otherSecurity Modelsen
dc.titlePartitioned group password-based authenticated key exchangeen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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