Abstract
The article proposes one-pass authenticated key establishment protocol in random oracles for Wireless Sensor Networks. Security of the protocol relies on Computational Diffie-Hellman Problem on Bilinear Pairings. In one-pass key establishment protocol, the initiator computes a session key and a related message. The key token is to be sent to the intended receiver using receiver's public key and sender secret key. From the received key token the receiver compute the session key, which is the same as the one computed by the sender, using sender public key and receiver's secret key. Because of low communication overhead, the scheme is better suited for Wireless Sensor Networks(WSNs) than the traditional key establishment protocol to establish the session key between two adjacent nodes