Abstract: Aiming at assuring the authenticity and creditability of the terminals in identifier/locator separation network, a provably secure three-elements peer access authentication protocol (PSTAAP) protocol was proposed. This protocol realized mutual authentication among all the communicating entities in the network (including terminal, access switch network and authentication center).It can effectively block unauthorized terminals to access the network,and can prevent unauthentic authentication center and access switch router from cheating the terminal.It was verified that this protocol was provably security based on Ballare-Rogaway extended model and performance analysis.

Key words: identifier/locator separation network, three-elements peer authentication, provably secure, access protocol