Abstract: A wireless LAN security system and method. The system includes a separate server managing an encryption key and an authentication certificate used for security, and providing the encryption key and the authentication certificate to an apparatus that requests them. Such apparatus including a wireless LAN terminal requesting the encryption key and the authentication certificate from the key management server and receiving them, and a wireless LAN access point requesting the encryption key and the authentication certificate from the key management server and receiving them. Accordingly, a user does not have to directly input the encryption key and the authentication certificate. Thus, a data protection level in wireless transmission and a security level of user authentication can be enhanced.