High Quality Content by WIKIPEDIA articles! Diameter is a AAA protocol, a type of computer networking protocol for authentication, authorization and accounting, and is a successor to RADIUS. Diameter controls communication between the authenticator (Secure Ticket Authority, STA) and any network entity requesting authentication. Diameter Applications extend the base protocol by adding new commands and/or attributes, such as those for use of the Extensible Authentication Protocol (EAP). In computer security, AAA commonly stands for “authentication, authorization and accounting”.Authentication refers to the process where an entity's identity is authenticated, typically by providing evidence that it holds a specific digital identity such as an identifier and the corresponding credentials. Examples of types of credentials are passwords, one-time tokens, digital certificates, and phone numbers (calling/called).

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