A Distributed Lightweight Group Rekeying Scheme with Speedy Node Revocation for Wireless Sensor Networks

In unattended or hostile environment like battlefield, sensor nodes may be compromised. If one node is compromised, group key which is shared by all the group members should be rekeyed in real-time and the compromised nodes should be revoked as soon as possible. As there is no such node that can always be trusted in sensor network, a distributed group rekeying scheme with speedy compromised node revocation is proposed in this paper. Based on a novelly constructed authentication polynomial, group rekeying is initiated by local network collaboratively in our scheme. Compared with the existing schemes, the proposed scheme can not only rekey in real-time, but reduce more communication overheads and provide a high level of security at the same time.