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Paper 2005/395

Secure Group Key Establishment Revisited

Jens-Matthias Bohli, Maria Isabel Gonzalez Vasco, and Rainer Steinwandt


We examine the popular proof models for group key establishment of Bresson et al. and point out missing security properties that are present in some models for two-party key establishment. These properties are actually of more importance in group key establishments due to the possibility of malicious insiders. We show that established group key establishment schemes from CRYPTO 2003 and ASIACRYPT 2004 do not fully meet these new requirements. Next to giving a formal definition of these extended security properties, we prove a variant of the explored proposal from ASIACRYPT 2004 secure in this stricter sense.

Available format(s)
Cryptographic protocols
Publication info
Published elsewhere. Unknown where it was published
group key establishmentprovable securitymalicious insiders
Contact author(s)
bohli @ ira uka de
2006-09-15: revised
2005-11-02: received
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Creative Commons Attribution


      author = {Jens-Matthias Bohli and Maria Isabel Gonzalez Vasco and Rainer Steinwandt},
      title = {Secure Group Key Establishment Revisited},
      howpublished = {Cryptology ePrint Archive, Paper 2005/395},
      year = {2005},
      note = {\url{https://eprint.iacr.org/2005/395}},
      url = {https://eprint.iacr.org/2005/395}
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