Scalable Session Key Construction Protocol for Wireless Sensor Networks

The security of sensor network s is ever more important nowadays. In this paper we propose a new protocol BROSK to construct link dependent keys by broadcasting key negotiation messages. The link-dependent key will be negotiated in an ad-hoc scheme. Most of the proposed security protocols in sensor networks are based on point-to-point handshaking procedures to negotiate link -dependent keys, but this will influence the scalability of the network. The simulation shows that the scalability of BROSK is better than two other security protocols of sensor network, SPINS and SNAKE, and is reasonably secure. This new protocol consumes less energy by reducing the number of transmissions used for key negotiation among sensor nodes.