More efficient identity-based authenticated key agreement with perfect forward secrecy

In 2002, Chen and Kudla proposed a novel identity-based authenticated key agreement protocol using elliptic curve bilinear pairings. Their protocol (referred to as Protocol 2' in their paper) is the most efficient one among such identity-based authenticated key agreement protocols that provides perfect forward secrecy (PFS) with only 1 pairing evaluation for each protocol participant. But, each party needs to transmit 2 elliptic curve points to its partner. In this paper, we propose a new identity-based authenticated key agreement protocol which is not only more computationally efficient but also, most importantly, reduces the total communication overheads to 50%. Furthermore, we show that our new protocol, same as Protocol 2′, achieves perfect forward secrecy as well as all the other desirable security attributes of authenticated key agreement protocols.