An efficient fault-tolerant group key agreement protocol

Authors:
Jianjie Zhao;Dawu Gu;Yali Li
Affiliations:
School of Information Security Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China;School of Information Security Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Venue:
Computer Communications
Year:
2010

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Abstract

Group key agreement (GKA) is a mechanism important for establishing a session key used to encrypt and/or decrypt sensitive messages transmitted to an intended group of receivers in an open network. An efficient group key agreement protocol capable of fault-tolerance named efficient GKA (EGKA) is proposed in this paper. EGKA is not only resistant to DoS attacks, replay attacks, man-in-the-middle attacks and common modulus attacks but also achieves forward secrecy. The efficiency analysis shows that EGKA is more efficient than previous fault-tolerant GKA protocols mentioned in our paper. Moreover, the long-term keys of participants can be reused which reduce the computational burden of the server.