DDH-based group key agreement in a mobile environment

Junghyun Nam, Jinwoo Lee, Seung-Joo Kim, Dongho Won

Research output: Contribution to journalArticle

51 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)73-83
Number of pages11
JournalJournal of Systems and Software
Issue number1
Publication statusPublished - 2005 Oct 1
Externally publishedYes


  • DDH assumption
  • Group key agreement
  • Mobile device
  • Multicast

ASJC Scopus subject areas

  • Computer Science Applications
  • Information Systems
  • Software

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