An Optimization of Rekeying Scheme for Secure Multicast

The security management of group key is essential to secure multicast. This paper analyzes the advantages and disadvantages of a key management scheme for secure multicast, and proposes a new rekeying scheme based on it. By adding one-way hash function, some users can calculate the keys along the path from their own point to root by themselves, and during a departure procedure, one user is selected toper form rekeying operation instead of key server. We analyze the overhead of communication cost, storage cost and computation cost of this scheme. The results show that this scheme can reduce communication cost and storage cost for key server compared to both LKH and the original scheme.