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Types of Authentication

CHAP - Challenge-Handshake Authentication Protocol
CHAP - Challenge-Handshake Authentication Protocol

In computing, the Challenge-Handshake Authentication Protocol (CHAP) authenticates a user or network host to an authenticating entity. That entity may be, for example, an Internet service provider. CHAP is specified in RFC 1994.

DIAMETER
DIAMETER

Diameter is an authentication, authorization, and accounting protocol for computer networks. It evolved from and replaces the much less capable RADIUS protocol that preceded it. It belongs to the application layer protocols in the internet protocol suite.

image: gl.com
EAP - Extensible Authentication Protocol
EAP - Extensible Authentication Protocol

The Extensible Authentication Protocol (EAP) is a protocol for wireless networks that expands on authentication methods used by the Point-to-Point Protocol , a protocol often used when connecting a computer to the Internet.

Kerberos (Protocol)
Kerberos (Protocol)

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography. A free implementation of this protocol is available from the Massachusetts Institute of Technology.

source: web.mit.edu
PAP - Password Authentication Protocol
PAP - Password Authentication Protocol

Password Authentication Protocol (PAP) is a simple user authentication protocol that does not encrypt the data and sends the password and username to the authentication server as plain text. PAP is very vulnerable to being read from the Point-to-Point Protocol (PPP) data packets exchanged between the authentication server and the user’s machine.

RADIUS
RADIUS

Remote Authentication Dial-In User Service (RADIUS) is a networking protocol, operating on port 1812 that provides centralized Authentication, Authorization, and Accounting (AAA or Triple A) management for users who connect and use a network service.

TACACS, XTACACS and TACACS+
TACACS, XTACACS and TACACS+

Terminal Access Controller Access-Control System ... username and password and send a query to a TACACS authentication ... TACACS and XTACACS. TACACS+ uses ...

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