摘要：The demand of the user roaming the service gadfly against with the rapid development of recently listening to mobile communication environment is coming to be high, the VoIP and the VPN back the new service appears and the commercial business anger accomplishes sooner or later and it is a quality thing. With the requirement which the but like this user is various for the real development of new services what sees the construction of information protection infra there is a reliability must precede. It is satisfactory to respect a like this demand, against the approach which is various it disposes and is it will can provide reliability and the AAA(Authentication, Authorization, Accounting) protocol it will lead and will be the possibility where it will accomplish. The AAA, the protocol only the P2P of existing the bay it knows with the VoIP and the Mobile IP back at the network which same next generation is various and protocol being an immediacy, is the user who is reliability, with the authority civil official and it is information protection mechanism which provides the gold. The AAA it tries to lead it is an user but authorization with the gold control is with the user who moves, it will follow in custody yes or no of data and it will be able to occur a multi branch problem point and when every the service where the user approaches from also an authorization each authorization information it demands, also the authorization civil official technique against hereupon will be able to occur a multi branch problem. With it follows in generous each service and authorization information with must dispose in the problem where the gold system and the levy
