关键词: 密钥协商, 基于身份, 中间人攻击, 椭圆曲线, 哈希函数, 可证明安全

Abstract: Aiming at the disadvantages that 3-Party Authenticated Key Agreement(3-PAKA) protocols are vulnerable to the impersonation attack and the man-in-the-middle attack, an improved ID-based authenticated key agreement protocol for 3-party is proposed. The new protocol adopts ID-based cryptography, elliptic curve cryptography and hash function techniques. Analysis results show that the proposed protocol is provable secure under Computational Diffie-Hellman(CDH) assumptions in the standard model, and it can resist against the man-in-the-middle attack. Additionally, an efficiency comparison of the proposed protocol and other improved protocols is given, and the protocol is more efficient.

Key words: key agreement, ID-based, man-in-the-middle attack, elliptic curve, hash function, provable security