关键词: 群密钥协商, 无证书协议, 可证明安全, 密钥托管, 公钥基础设施

Abstract: Group authenticated key agreement protocol can help participants establish a session key in an open communication channel. In this paper, it proposes an effective PKC-based certificateless group authenticated key agreement protocol, the certificateless mechanism of the protocol simplifies the complex certificate management problem and key escrow problem in ID-based protocols. The security of the scheme is proved and its computational cost is discussed. The result shows that the new protocol is secure and effective.

Key words: group key agreement, certificateless protocol, provable security, key escrow, Public Key Infrastructure（PKI）