A constant size rekeying message framework for secure multicasting

We propose a new framework for key management to construct a secure multicasting environment. When rekeying, only one message needs to be generated, and the message size is a constant. Especially when the group size is large, our framework largely reduces the traffic in the network. Two solutions are given to carry out this framework, which are closed curve solution (CCS) and perpendicular space solution (PSS), respectively. One is based on a geometric approach and the other on a linear algebraic approach. Our framework is also compatible to other group communication protocols.