Introduction to Kerberos

Welcome to a new series on Active Directory and Kerberos. In this first installment, I’ll show the basics of how Kerberos works, with future installments I’ll showcase attacks on Kerberos and further explain Active Directory.

Contents

• What is Kerberos?
• How does Kerberos work?
• Ticket exchange
• AS-REQ
• AS-REP
• Digression: PAC
• TGS-REQ
• TGS-REP
• AP-REQ
• AP-REP
• TL;DR
• Sources

What is Kerberos?

If you are new to Active Directory, this might be your first question. In the simplest terms, Kerberos is …

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