An extended identity based authenticated asymmetric group key agreement protocol

Lei et al. [26] proposed a new asymmetric group key agreement protocol allowing a set of users to negotiate a common encryption key accessible by any user, and each user holds her respective decryption key. This enables the confidential message communication among group users, and grants any outsider to send message to the group. In this paper, an authenticated asymmetric group key agreement protocol is proposed, which offers security against active as well as passive attacks. Proposed protocol uses broadcast encryption mechanism without relying on the trusted dealer to distribute the secret key. An identity based feature is included in the protocol to provide authentication.