A Centralized Key Table based Communication Efficient Group Key Management Protocol

Manisha Y. Joshi Rajankumar S. Bichkar

Journal: International Journal of Computer Network and Information Security(IJCNIS) @ijcnis

Article in issue: 8 vol.7, 2015.

Free access

Group key management is an integral part of secure multicast. Minimizing the number of rekeying messages, maintaining the forward and backward secrecy has always been a challenging task. Though there are many solutions which reduce the rekeying messages from Ο(n) to Ο(log_2?〖n),〗 they increase with the increase in group size. In this paper, we present a centralized key table based communication efficient group key management protocol in which number of rekeying messages is independent of the group size. In this protocol key management server (KMS) divides a group of n members into n subgroups of size n-1 and maintains a table of n subkeys along with member ID and one group key. Each member has n-1 subkeys, which is a subset of n subkeys of KMS and one group key. The proposed protocol requires only one multicast rekeying message per joining of a new member as well as per eviction of any existing member. As the number of rekeying messages is not dependent on group size, it requires less computation.

Group key management \ rekeying \ subkeys \ secure multicast \ forward \ backward secrecy

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