Cryptology ePrint Archive: Report 2006/214
Password-Authenticated Constant-Round Group Key Establishment with a Common Reference String
Jens-Matthias Bohli and Maria Isabel Gonzalez Vasco and Rainer Steinwandt
Abstract: A provably secure password-authenticated protocol for group key establishment in the common reference string (CRS) model is presented. Our construction assumes the participating users to share a common password and combines smooth hashing as introduced by Cramer and Shoup with a construction of Burmester and Desmedt. Our protocol is constant-round. Namely, it is a three-round protocol that can be seen as generalization of a two-party proposal of Gennaro and Lindell.
Category / Keywords: cryptographic protocols / passwords, group key establishment, projective hash functions
Date: received 27 Jun 2006, last revised 27 Apr 2009
Contact author: bohli at ira uka de
Available formats: PDF | BibTeX Citation
Note: Updated protocol and extended proof.
Version: 20090427:152851 (All versions of this report)
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