most of the tripartite authenticated key agreement protocols have been proven to be insecure.We design the new identity-based tripartite authenticated key agreement protocol
it is based on the secure IBE scheme by Peng.This protocols security based on bilinear decisional Diffie-Hellman assumption.This protocol could provide known key security
PKG forward secrecy
key-compromise impersonation resilience and unknown key-share resilience
so its a secure tripartite authenticated key agreement protocol.