---
id: 9411
title: "User-to-User Authentication: Down the Rabbit Hole – Part 1"
source_domain: specterops.io
source_url: "https://specterops.io/blog/2026/06/09/user-to-user-authentication-down-the-rabbit-hole-part-1/"
published_at: "2026-06-09T16:00:00Z"
phying_url: "https://phying.com/item/9411"
lang: en
---

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

## Summary

A deep dive into Kerberos User-to-User (U2U) authentication and the primitives behind UnPAC-the-Hash, ADCS and shadow credentials.

## Intelligence Metadata

- **Sources:** specterops.io
- **Published:** 2026-06-09T16:00:00Z
- **Original:** https://specterops.io/blog/2026/06/09/user-to-user-authentication-down-the-rabbit-hole-part-1/
- **Phying News:** https://phying.com/item/9411