An efficient certificateless two-party authenticated key agreement protocol

Due to avoiding the key escrow problem in the identity-based cryptosystem, certificateless public key cryptosystem (CLPKC) has received a significant attention. As an important part of the CLPKC, the certificateless authenticated key agreement (CLAKA) protocol also received considerable attention. Most CLAKA protocols are built from bilinear mappings on elliptic curves which need costly operations. To improve the performance, several pairing-free CLAKA protocols have been proposed. In this paper we propose a new pairing-free CLAKA protocol. Compared with the related protocols our protocol has better performance. We also show our protocol is provably secure in a very strong security model, i.e. the extended CanettiKrawczyk (eCK) model.