Read this article about the history of Diameter and why it was developed. What preceded Diameter as an authentication protocol? While you do not need to understand how Diameter authenticates, you should have a general idea of its authentication process.


The DIAMETER protocol is designed to provide an Authentication, Authorization and Accounting (AAA) framework for applications such as network access or IP mobility and also intended to work in local Authentication, Authorization & Accounting and roaming situations.

The Diameter protocol was initially developed by the Internet Engineering Task Force (IETF) as an Authentication, Authorization, and Accounting (AAA) framework Diameter was further embraced by the Third Generation Partnership Project (3GPP) as the key protocol for AAA and mobility management in 3G networks.

The DIAMETER protocol consists of a base protocol, defined in [RFC 3588] September 2003 and it is obsolete by [RFC 6733] October 2012, and set of applications (also called extension of the base protocol). The base protocol must be supported by all applications. The base protocol must be supported by all applications.


Source: V. A. Sowmya, Nagarathna, and Ajay Satyanarayana,
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