![]() The KDC creates a ticket granting ticket (TGT) for the user, encrypts it with the user’s password, and returns it to the client. If the KDC can decrypt the request with the user’s password it has stored, it knows the client has supplied the correct password for the user. A client requests a ticket for a user from the KDC, using the user’s password to encrypt the request. Kerberos Authentication ProcessĮach step of Kerberos authentication employs cryptography to protect packets from being altered or read and provide mutual authentication. Certain user passwords are used to encrypt and sign specific tickets, but the root of the Kerberos security is a key known only to the trusted third party that issues the tickets. The tickets utilize symmetric encryption technology. Ticket Granting Service (TGS) - Accepts authenticated clients and issues them tickets to access other resources.Authentication Service (AS) - Authenticates clients and issues them tickets.In Active Directory, each domain controller acts as a KDC and provides two core services: Microsoft expanded upon the base protocol specification, adding a number of extensions to implement features specific to Active Directory and the Windows Server operating systems. Active Directory Security Best Practices. ![]() It is based on Kerberos Network Authentication Service (V5). However, Microsoft Active Directory is the most widely consumed Kerberos implementation. Support for Kerberos is found in almost every operating system, including Apple OSX/iOS and many UNIX and Linux distributions. Key Distribution Center (KDC): A trusted third party that issues tickets.Application Server (AP): The service that the client or user wants to access.Client: The entity seeking to provide its identity.Kerberos was named after the three-headed dog because of the three different actors in the protocol: Read on to learn how Kerberos authentication works and get valuable tips for avoiding issues. The Kerberos meaning in technology is analogous: Kerberos is an authentication protocol guards the network by enabling systems and users to prove their identity to one another before access to resources is granted. In Greek mythology, Kerberos is a multi-headed dog that guards the gates of the underworld.
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