Security Weakness in Ren et al.’s Group Key Agreement Scheme Built on Secure Two-Party Protocols

  • Junghyun Nam
  • Seungjoo Kim
  • Dongho Won
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3786)

Abstract

A group key agreement protocol is designed to allow a group of parties communicating over an insecure, public network to agree on a common secret key. Recently, in WISA’04, Ren et al. proposed an efficient group key agreement scheme for dynamic groups, which can be built on any of secure two-party key establishment protocols. In the present work we study the main EGAKA-KE protocol of the scheme and point out a critical security flaw in the protocol. We show that the security flaw leads to a vulnerability to an active attack mounted by two colluding adversaries.

Keywords

Group key agreement key authentication collusion attack 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Junghyun Nam
    • 1
  • Seungjoo Kim
    • 1
  • Dongho Won
    • 1
  1. 1.School of Information and Communication EngineeringSungkyunkwan UniversityRepublic of Korea

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