If an attacker tries to capture and decrypt the information in a ticket, the breach will be limited to the current session. The timestamp included in the ticket indicates that it's a recently generated ticket and is not a replay attack. This decrypted ticket indicates the proof of the client's identity and is used to authenticate the client. If the client successfully decrypts the ticket, it keeps the ticket, which is now shared by the client and the server. The client then attempts to decrypt the ticket by using its password. Then, the authentication server grants the client encrypted tickets that include client information and the session key that expires after a specified period of time. In this scheme, a client must provide a valid user name and password only once to prove their identity to an authentication server. Kerberos protocol uses cryptography to help provide secure mutual authentication for a network connection between a client and a server, or between two servers. Outlook 2016 for Mac supports Kerberos protocol as a method of authentication with Microsoft Exchange Server and standalone LDAP accounts.
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