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This is stopped by authenticators. Whenever you present a Kerberos ticket, it must be accompanied by an authenticator, which is encrypted using the session key and contains (among other info) a timestamp. The server checks that the timestamp is recent (in Kerberos 4, this means "within 5 minutes;" in 5, it is configurable, but 5 minutes is the default) and ...


Encrypting the very first message sent from the client with the secret key would present significant issues for the Authentication Server. If this initial request were encrypted, the Authentication Server would not be able to determine which user made the request and therefore which secret key is needed to decrypt the same request. This cleartext ...

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