User-based Access
The user-based access methods work by authorizing specific users to connect to the server. When a client establishes a connection to a server, it has to prove being controlled by an authorized user.
The two methods based on authenticating users are SUN-DES-1 and MIT-KERBEROS-5. The first system is based on a mechanism of secure remote procedure call developed in SunOS. The second mechanism is based on both client and server trusting a Kerberos server.
Read more about this topic: X Window Authorization
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