Overview of Key Agreement Protocols.

Youssouf Achouri, Rima Djellab, Khaled Hamouid

Colin Boyd, Anish Mathuria, Douglas Stebila

Wenhao Liu, Chunxiang Xu, Jian Feng Xu

Certificateless cryptography aims at combining the advantages of identity based and public key cryptography in order to avoid the key escrow problem inherent in the identity based cryptography and cumbersome certificate management in the traditional public key infrastructure. The provably secure certificateless key agreement protocol is proposed by Lippold et al. in 2009, but their protocol suffers from computation burden. Owing to the above-mentioned situations, a new certificateless two party key agreement protocol (CL-KA) is proposed and the security attributes are analyzed in the extended Canetti-Krawzcyk(eCK) security model. Our protocol only requires each entity to compute two pairings, up to now, it turns out to be the most efficient one of all the previously known security CL-KA schemes.

Colin Boyd, Anish Mathuria

Andrew William Roscoe, Lei Wang

XU Chun-xiang

A few of certificateless key agreement schemes have been proposed in recent years,all of them need pairing operations,what's more,most of them are vulnerable to the key compromise impersonation attack and resistance to leakage of ephemeral keys.The provably secure certificateless key agreement protocol was proposed by Lippold in 2009,but their protocol suffered from computation burden.In order to solve the above-mentioned problem,this paper proposed a new pairing-free certificateless two party key agreement scheme (CL-KA) and presened its security properties.The new scheme was secure as long as each party had at least one uncompromised secret.Thus,the new scheme was secure even if the key generation centre learned the ephemeral secrets of both parties.The new scheme achieves efficiency in computational cost when compared with Lippold's protocol.