Secure and efficient key generation in new multi party key agreement protocol

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.

Shanchuan Pang, Quanrun Li, Hu Ma +1 more

Zhang Long-xiang

Jie Tang, Lei Shi, Jiahua Wei +2 more

Based on the logic Bell states, we present two novel multi-party quantum key agreement (QKA) protocols under collective noise. The proposed protocols make full use of four-qubit logic Bell states as quantum resources and perform the novel encoding operation to generate the shared key. The security analysis shows that these two protocols can resist against both participant and outsider attacks. Furthermore, compared with the other existing multi-party QKA protocols over collective noise, our protocols have higher qubit efficiency. Finally, we perform the simulation of the relationship between efficiency and security, which is completely consistent with the conclusion of the security analysis of the protocols.

Fei DENG, Jun He

YuXiu-Ying, ZhangWen-Fang, HeDa-Ke

Authenticated key agreement (AKA) protocol allows two or multi-parties exchange messages, authenticate each other and establish shared session keys for later secure communications over an open network. The certificateless -based authenticated key agreement protocols combined the advantages of the traditional PKI and the identity-based cryptography. This paper analyzes a proposed AKA protocol[6] and presents a new certificateless AKA protocol. Furthermore, we examines the security of the new protocol and compare it to the existing certificateless key agreement protocols in efficiency. The new proposed scheme achieves almost all of the desired security attributes and is more practicable.