An ID-based key agreement protocol based on ECC among users of separate networks

This paper proposes an identity based key agreement protocol based on elliptic curve cryptography (ECC) between users of different networks with independent private key generations (PKGs). Instead of bilinear pairings which commonly used for contracting identity based schemes, the proposed protocol makes use of elliptic curves to obtain more computational efficiency. The proposed protocol develops Cao et al´s protocol for situations that two users of independent organizations or networks with separate servers want to share a secret key via an insecure link. The main novelty of this paper is security proof of the proposed protocol in the random oracle model. The security proof argues the security attributes of the proposed protocol.