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What is the primary purpose of a KDC in Kerberos?
To facilitate key exchange with a Certifying Authority
To generate PKI keys when requested by communicating parties
To generate pseudo-random numbers that help generate keys for communication
To reduce the risk of compromise involved while exchanging keys
A KDC authenticates a user requesting a service and then grants a ticket to use the service. EDIT: Key Distribution Center (KDC).
Tricky question: Lots of close almost correct answers. Here is a more detailed explanation: Kerberos Key Distribution Center (KDC) is a network service that accepts requests for tickets from Kerberos clients, validates their identity, and grants tickets to them. This form of symmetric encryption allows the access of two or more systems in a network by generating a unique ticket type key for establishing a secure connection over which data is shared and transferred. The KDC controls and issues those tickets to reduce the risk of compromise while exchanging tickets. The other answers are incorrect: KDC doesn't use PKI or Certificate Authorities (Kerberos KDC is contained in Kerberos tools) nor is the generated ticket numbers based. The ticket is a symmetric encryption than can be a combination of characters/numbers.
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