Authentication process
Authentication process is the critical issue on mobile broadband service. Authentication process will determine how secure the network while unauthorized user try to access the mobile broadband service. To protect the service, telecommunication provider applies some security procedure before the access the service. Authentication, Authorization and Accounting (AAA) server is the network element which is designed and implemented for that purpose on mobile internet service such as CDMA 1x, 3G, EVDO and WIMAX
PAP and CHAP
There are two type of authentication procedure which can be implemented on mobile broadband service which can be applied on PDSN or GPRS. They are Password Authentication Protocol (PAP) and Challenge Handshake Authentication Protocol (CHAP). PAP and CHAP can be implemented on the mobile broadband service but for the security purpose, telecommunication provider used use Challenge Handshake Authentication Protocol (CHAP) method due to more secure than PAP
Password Authentication Protocol (PAP) method is simple authentication where mobile broadband customer need only to send some parameter from the Mobile Station (MS) and then Authentication, Authorization and Accounting (AAA) server will identify those parameter before they allow to access the service. Meanwhile Challenge Handshake Authentication Protocol (CHAP) method process is more complicated than PAP since there will be a challenge that will be added while Mobile Station (MS) will establish the connection. Authentication, Authorization and Accounting (AAA) server will indicate the challenge which is delivered by Mobile Station (MS) to PDSN and AAA, if all parameters requires is matched than authentication process pass and vice versa
Password Authentication Protocol (PAP) method will identify some parameters which is sent by mobile telecommunication subscriber such as International Mobile Subscriber Identify (IMSI), username and password (encrypted or decrypted). Meanwhile Challenge Handshake Authentication Protocol (CHAP) method will send more parameters beside those parameters on PAP such as challenge and message ID through Message-Digest algorithm 5 (MD5) algorithms. The procedure on CHAP will guarantee that the mobile broadband service will have only authorized users only to access the service
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