A Centralized Key Table based Communication Efficient Group Key Management Protocol
Manisha Y. Joshi, Rajankumar S. Bichkar · International Journal of Computer Network and Information Security · 2015
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 ( ) to ( ) 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 members into subgroups of size and maintains a table of subkeys along with member ID and one group key.Each member has subkeys, which is a subset of 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.