Efficient identity-based authenticated key agreement protocol with PKG forward secrecy

For an identity-based authenticated key agreement (IDAK) protocol, PKG forward secrecy is the strongest notion of forward secrecy, which is about the security of previ-ously established session keys after the master secret key of the Private Key Generatior (PKG) is compromised. In this paper, we put forward a new identity-based authen-ticated key agreement protocol which achieves PKG for-ward secrecy. On its performance, we show that it is more computational efficient than a previously proposed proto-col of Chen and Kudla (called Protocol 20). Furthermore, we examine other security attributes that our new proto-col possesses one bye one.