Multicast Rekeying Protocol Based on Huffman One-Way Function Tree

Considering the difference in probability of various members leaving the communication group the paper proposes a new multicast rekeying protocol based Huffman one-way function tree (HOFT). The paper introduces the OFT multicast rekeying protocol, proposes the HOFT multicast rekeying protocol including the HOFT initialization algorithm and the HOFT multicast rekeying protocol when a member adds to or leaves the communication group. The paper then analyzes the performance of the HOFT multicast rekeying protocol on the number of rekeying messages and the number of keys the GC and member should save. Average performance of the HOFT multicast rekeying protocol appears to be the best among all the multicast rekeying protocols based on OFT.