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replay attacks

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Good afternoon,

In defining theservicetimebetween adomaincontrollerand a clientisthe statementbelow:

To prevent"replay attacks,"KerberosV5usesstampsdate / timeas part of itsprotocol definition.Forthe stampsdate / timefunction properly,the clocksof the client andthedomain controllermust besynchronizedas much as possible

I would like tobetter understandwhat exactly:

"replay attacks"and howeffectivelyit couldstick afirewall blockingfor example?

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