关键词: 群密钥协商, 基于身份的认证, Weil对, 三叉树

Abstract: Group Key Agreement（GKA） protocol plays a key role in the construction of secure multicast channels. Because of the simplicity and efficiency of public key management, the ID-based Authenticated Group Key Agreement Protocol（AGKA） cryptosystem has become a hot research direction in recent years. This paper proposes a new Weil pairing and completely trigeminal tree based group key agreement protocol, designs the participants join-and-leave pre-protocol. Security analysis and performance analysis show that the new scheme satisfies all known security requirements. Compared with the existing schemes, the new scheme has obvious advantages in terms of performance.

Key words: Group Key Agreement（GKA）, ID-based authentication, Weil pairing, trigeminal tree