What is Kerberos? What four requirements were defines for Kerberos?
Subject Computer and Network Security
NU Year Set: 5.(b) Marks: 1+4 Year: 2015

Kerberos is a protocol for authenticating service requests between trusted hosts across an untrusted network, such as the internet. Kerberos is built in to all major operating systems, including Microsoft Windows, Apple OS X, FreeBSD and Linux.

  • A basic third-party authentication scheme
  • Have an Authentication Server (AS)
  • users initially negotiate with AS to identify self
     AS provides a non-corruptible authentication
    credential (ticket granting ticket TGT)
  •  Have a Ticket Granting server (TGS)
     users subsequently request access to other services
    from TGS on basis of users TGT
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