Patent ID: 7234057

Claim:
A method for processing an access-request message for packet service, comprising: writing a temporary randomly generated authenticator value in an attribute field of an access-request message; encrypting a user password using the temporary authenticator value; executing an encryption algorithm using the access-request message having the temporary authenticator value and the encrypted user password to generate a message digest, the access-request message having an authenticator field that is filled with a prescribed value; generating a final access-request message, the final access-request message being generated by using the access-request message and replacing the value of the authenticator field with the message digest; transmitting the final access-request message to an Authentication, Authorization and Accounting (AAA) server; and verifying the final access-request message by the AAA server using the prescribed value, wherein the prescribed value is a value previously defined between a foreign agent and the AAA server.