Paper 2009/300

Universally Composable Contributory Group Key Exchange

M. Choudary Gorantla, Colin Boyd, and Juan Manuel Gonzàlez Nieto

Abstract

We treat the security of group key exchange (GKE) in the universal composability (UC) framework. Analyzing GKE protocols in the UC framework naturally addresses attacks by malicious insiders. We define an ideal functionality for GKE that captures contributiveness in addition to other desired security goals. We show that an efficient two-round protocol securely realizes the proposed functionality in the random oracle model. As a result, we obtain the most efficient UC-secure contributory GKE protocol known.

Note: Full version.

Metadata
Available format(s)
PDF PS
Category
Cryptographic protocols
Publication info
Published elsewhere. AsiaCCS 2009
Keywords
Group Key ExchangeContributivenessUniversal Composition
Contact author(s)
mc gorantla @ isi qut edu au
History
2009-06-24: received
Short URL
https://ia.cr/2009/300
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2009/300,
      author = {M.  Choudary Gorantla and Colin Boyd and Juan Manuel Gonzàlez Nieto},
      title = {Universally Composable Contributory Group Key Exchange},
      howpublished = {Cryptology ePrint Archive, Paper 2009/300},
      year = {2009},
      note = {\url{https://eprint.iacr.org/2009/300}},
      url = {https://eprint.iacr.org/2009/300}
}
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