An optimized approach for Multicast Rekeying using MDS code on PFMH tree
Antony Selvadoss Thanamani · 2010
For any multicast group communication, group key agreement was found to be a vital challenge because of its dynamic nature. Although many solutions have been proposed to handle group key changes, this paper gives different aspect for rekeying. A new multicast key distribution scheme (1) was proposed to reduce computation complexity by employing MDS codes, a class of error control codes, on a key tree to distribute multicast key dynamically instead of conventional encryption algorithms. But that scheme is managing key distribution in a centralized manner. In this paper we propose a distributed key distribution scheme, using a logical group key structure, PFMH tree, and the concept of virtual user position. The proposed scheme applied upon any single user join or leave and multi user joins or leave event. This approach ensures the forward secrecy and backward secrecy, reduces the rekeying complexity, communication, computation and storage complexity and time cost.