Method and apparatus for authentication in wireless internet system

The present invention relates to a wireless internet subscriber authentication method and apparatus in a wireless Internet network so as to provide a mutual authentication between the subscriber and the network, and share the key with each other, the authentication server is moved on the basis of the private key and the first random number terminal in generating the information of RES1 to be used for authentication of the network, generates information of XRES2 is based on the private key and a second random number used for the subscriber identity, the mobile terminal network from the private key and the first random number and generating the authentication information of XRES1 compares the XRES1 with the RES1 and authenticate the network, generates the user identity information, the RES2 from the secret key and the second random number, at the same time prevent the user of the network unauthorized use by a subscriber identity, network, and by authenticating the server itself, and prevent the leakage of personal information of the subscriber by the rogue server, the more secure communications because of the longer key The.