Encryption: RADIUS

The most widely used standard for communication between the authenticator and the authentication server, Remote Access Dial-In User Service (RADIUS), is an IETF standard that defines the functions of the authentication server and the protocols to access those functions. RADIUS is a client/server User Datagram Protocol (UDP) application that runs over IP. The authentication server is the RADIUS server, and the authenticator is the RADIUS client. In addition to authentication, RADIUS supports authorization and accounting functions, such as measuring session volume and duration that can be used for charging and billing purposes. The authentication, authorization, and accounting functions are collectively referred to as AAA functions. Numerous extensions to RADIUS have been defined to accommodate a variety of needs, including supporting EAP. (Wimax Forum, 2007)

RADIUS, however, does have a number of deficiencies that cannot be easily overcome by modifications. Recognizing this, the IETF has developed a new standard for AAA functions: DIAMETER. Although not backward compatible with RADIUS, DIAMETER does provide an upgrade path to it. DIAMETER has greater reliability, security, and roaming support than RADIUS does. (Wimax Forum, 2007)

See Also:

Encryption In WiMAX

Advance Encryption Standard In WiMAX

Public Key Infrastructure

Authentication & Access Control