The system and method for performing mutual authentication of mobile terminal

PURPOSE: A mutual authentication system and method for mobile terminals are provided to exchange data only between authenticated objects by using challenges between a mobile terminal, which is an object of a mutual authentication system, and an authentication server. CONSTITUTION: An authentication agent(120) transmits a first challenge signal to a mobile terminal(110)(111). The mobile terminal transmits a first answer signal as a response about the first challenge signal to the authentication agent(112). The authentication agent transmits a query signal to an authentication server(130)(113). The authentication server transmits a second challenge signal as the response about the query signal to the authentication agent(114). The authentication agent transmits a second response signal to the authentication server(115). The authentication server transmits a first acknowledgement and encryption data to the authentication agent(116). The authentication agent transmits a second acknowledgement related to a mobile terminal to the mobile terminal(117).