User-to-User Authentication: Down the Rabbit Hole – Part 1

<p class="wp-block-paragraph"><em><strong>TL;DR: </strong>This blog post covers Windows internals and how Kerberos user-to-user (U2U) authentication works under the hood versus showing how to execute an attack.</em></p>

<p class="wp-block-paragraph">U2U authentication came into the spotlight after the Active Directory Certificate Services (ADCS), UnPAC-the-Hash, and Shadow Credentials attacks.