Paper 2004/127

DDH-based Group Key Agreement in a Mobile Environment

Junghyun Nam, Jinwoo Lee, Seungjoo Kim, and Dongho Won


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.

Available format(s)
Cryptographic protocols
Publication info
Published elsewhere. Unknown where it was published
group key agreementmulticastsecurity modelDDH
Contact author(s)
jhnam @ dosan skku ac kr
2004-12-08: last of 2 revisions
2004-06-03: received
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Creative Commons Attribution


      author = {Junghyun Nam and Jinwoo Lee and Seungjoo Kim and Dongho Won},
      title = {{DDH}-based Group Key Agreement in a Mobile Environment},
      howpublished = {Cryptology ePrint Archive, Paper 2004/127},
      year = {2004},
      note = {\url{}},
      url = {}
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