Security improvement on a group key exchange protocol for mobile networks

Authors:
Junghyun Nam;Kwangwoo Lee;Juryon Paik;Woojin Paik;Dongho Won
Affiliations:
Department of Computer Engineering, Konkuk University, Korea;Department of Computer Engineering, Sungkyunkwan University, Korea;Department of Computer Engineering, Sungkyunkwan University, Korea;Department of Computer Engineering, Konkuk University, Korea;Department of Computer Engineering, Sungkyunkwan University, Korea
Venue:
ICCSA'11 Proceedings of the 2011 international conference on Computational science and its applications - Volume Part IV
Year:
2011

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Abstract

A group key exchange (GKE) protocol is designed to allow a group of parties communicating over a public network to establish a common secret key called a session key. As group-oriented applications gain popularity over the Internet, a number of GKE protocols have been suggested to provide those applications with a secure multicast channel. Among the many protocols is the GKE protocol presented by Dutta and Dowling for mobile ad hoc networks. In this paper, we are concerned with the security of the Dutta-Dowling protocol. Their protocol carries a proof of security in the standard adversarial model which captures unknown key-share attacks. But unlike the claim of provable security, the Dutta-Dowling protocol fails to achieve unknown key-share resilience. We here reveal this security vulnerability of the protocol and show how to address it.