Patent ID: 7065067

Claim:
An authentication method for safe communication between a home agent (HA) and a mobile node (MN) in a wireless communication system including the HA, a foreign agent (FA) connected to the MN assigned a Mobile IP address, and first and second servers provided respectively to the HA and the FA for authentication, comprising the steps of: upon receiving a Registration Request message from the MN, generating by the FA an Access Request message and transmitting to the first server through the second server the generated Access Request message; upon receiving the Access Request message, generating by the first server an authentication shared key with a preset number by the first server and transmitting to the FA through the second server the generated authentication shared key; authenticating by the FA the Registration Request message according to the authentication shared key and transmitting to the HA the authenticated Registration Request message; determining by the HA whether the preset number is included in the authenticated Registration Request message; and registering by the HA the MN when the preset number is included in the authenticated Registration Request message.