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Kerberos v4 compromised TGS

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What would happen under the Kerberos v4 protocol if an attacker has compromised TGS and identified the Ktgs key?

What would be the outcomes of such an attack?

Answers

Then there would be no more secrecy. If you manage to get to the Ticket Granting System Kerberos cannot offer any security anymore as you will be able to view the session keys used by clients.

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