Explore advanced Linux security concepts and authentication vulnerabilities in this conference talk from Derbycon 2016. Delve into trust relationships, authentication back alleys, and forgotten features as Ronnie Flath guides you through an example environment, demonstrating how to obtain a root shell, manipulate Kerberos ticket caches, and exploit outsourced authentication. Learn about SSH master mode and gain insights into potential security weaknesses in Linux systems, equipping yourself with knowledge to better protect and secure your infrastructure.