Kerberos is a trusted, credential-based, third-party authentication protocol that uses symmetric (secret) key cryptography to provide robust authentication to clients accessing services on a network.
One weakness of Kerberos is its Key Distribution Center (KDC), which represents a single point of failure.
The KDC contains a database that holds a copy of all of the symmetric/secret keys for the principals.
Reference(s) used for this question:
KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, John Wiley & Sons, 2001, Chapter 2: Access control systems (page40).
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