Kerberos is a secret key cryptography system using a KDC -- Key distribution center which keep authorized people and their master keys. A more precise statement is that the client has knowledge of an encryption key that is known by only the user and the authentication server. Similarly, each application server shares an encryption key with the authentication server, i.e., the server key. The Kerberos Authentication System uses a series of encrypted messages to prove to a verifier that a
client is running on behalf of a particular user.
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