Attacking Group Multicast Key Management Protocols Using Coral
Electronic Notes in Theoretical Computer Science (ENTCS)
Active attacking multicast key management protocol using alloy
ABZ'12 Proceedings of the Third international conference on Abstract State Machines, Alloy, B, VDM, and Z
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Many network application based on a group communications model have been developed. As a result, securing group communications, i.e., providing confidentially authenticity, and integrity of messages delivered between group members, will become a critical networking issue. In this paper, we present a novel solution to the problem of the scalable group management. For the rekeying of the group key, all members of the group should agree the rekeying of the key. However, synchronization with all members for agreement of the rekeying is very costly. We propose the asynchronous rekeying framework based on the reliable and totally ordered multicast protocols (RTOMP). In our framework, a group is consists of some domains which has some group members and one trusted key distribution server (KDS). When the membership of a domain is changed, the KDS of the domain creates the group key and distributes to the all other KDSs via the secure multicast channel on its own responsibility. The KDS also sends the group key which is encrypted by the individual key to all new members of the domain. Therefore, the cost of the creation and distribution of the group key is dispersed over the all KDSs. From our simulations, the group key managed at the KDS is reasonable and scalability is improved even if the ratio of the key change is high.