Multicast for multimedia collaborative applications: services and mechanisms
International Journal of Advanced Media and Communication
A key management scheme for secure group communication using binomial key trees
International Journal of Network Management
An efficient key tree management algorithm for LKH group key management
ICOIN'06 Proceedings of the 2006 international conference on Information Networking: advances in Data Communications and Wireless Networks
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In many secure group communication models, thereexists a group manager that creates the group key anddistributes it to every group member. Such groupmanager is responsible for changing and re-distributing(rekeying) the group key whenever it deems necessary.Many applications will require very fast rekeying so thatit is not disruptive to their performance. In this paper, wepresent a generic software model for secure group keymanagement. We present the main components along withtheir functionality and interactions. With emphasis on therekey manager, we discuss two issues that criticallyimpact the rekey time: establishment and maintenance ofthe logical key hierarchy (LKH), and the rekey packetconstruction for a changed key. We show that our novelidea of maintaining balanced LKH as B+ search treegreatly reduces the number of changed keys compared toan unbalanced LKH. In addition, we show that a rekeypacket construction using simple XOR operationsbetween keys instead of the usual encryption techniquesubstantially reduces rekey time. We performedexperiments that demonstrate the effectiveness andfeasibility of our approaches.