Question: In Kerberos v 4 : When a server S receives a Ticket from Alice, how does the server S know the Ticket is genuine? When

In Kerberos v4: When a server S receives a Ticket from Alice, how does the server S know the Ticket is genuine? When Alice receives a reply from a server S, how does she know the reply came from the server S (that its not a replay of an earlier message from the server S)?

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