Universally Composable Contributory Group Key Exchange

M.  Choudary Gorantla; Colin Boyd; Juan Manuel Gonzàlez Nieto

Paper 2009/300 Original: eprint.iacr.org/2009/300 ↗

Universally Composable Contributory Group Key Exchange

M. Choudary Gorantla

Colin Boyd

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.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Preprint.
History: 2009-06-24: last updated; 2009-06-24: published
Short URL: https://ia.cr/2009/300
License: https://creativecommons.org/licenses/by/4.0/

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},
      url = {https://eprint.iacr.org/2009/300}
}