Group Key Management Using Proxy Re-encryption for Dynamic Networks
Zhang Minqing, Xuguang Wu, Han Yiliang, Yang Xiaoyuan · 2010
Decentralized group key management mechanisms offer beneficial solutions to enhance the scalability and reliability of a secure multicast framework by dividing the whole group into subgroups. However, many of the previous decentralized solutions require the trust key distribution center, or don't exploit the broadcast nature of wireless communication. In the study, a novel group key management scheme is proposed, which employs decentralized group membership, doesn't relay on the trust center, and makes use of the wireless broadcast nature to efficiently accommodate dynamic group changes. The main contributions are:(1) we extend a proxy re-encryption to multi-hop environment, and then develop a distributed protocol for key distribution; (2) in local group communication, we use multi-recipients encryption to broadcast key information reducing communication cost; (3) we analyze the proposed scheme with the previous schemes and the analysis result indicates that the proposed scheme has advantages with regard to the rekeying cost, storage overhead and computation efficiency.