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DDH-based Group Key Agreement in a Mobile Environment

Authors:
Junghyun Nam
Jinwoo Lee
Seungjoo Kim
Dongho Won
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URL: http://eprint.iacr.org/2004/127
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Abstract: A group key agreement protocol is designed to efficiently implement secure multicast channels for a group of parties communicating over an untrusted, open network by allowing them to agree on a common secret key. In the past decade many problems related to group key agreement have been tackled and solved (diminished if not solved), and recently some constant-round protocols have been proven secure in concrete, realistic setting. However, all forward-secure protocols so far are still too expensive for small mobile devices. In this paper we propose a new constant-round protocol well suited for a mobile environment and prove its security under the Decisional Diffie-Hellman assumption. The protocol meets simplicity, efficiency, and all the desired security properties.
BibTeX
@misc{eprint-2004-12099,
  title={DDH-based Group Key Agreement in a Mobile Environment},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / group key agreement, multicast, security model, DDH},
  url={http://eprint.iacr.org/2004/127},
  note={ jhnam@dosan.skku.ac.kr 12760 received 29 May 2004, last revised 7 Dec 2004},
  author={Junghyun Nam and Jinwoo Lee and Seungjoo Kim and Dongho Won},
  year=2004
}