Learn advanced physical security hardening techniques in this 18-minute conference talk that builds upon fundamental bypass methods to focus on protective countermeasures. Discover how to defend against common physical security attacks including the Under the Door attack, latch slipping, and other door installation vulnerabilities. Explore practical remediation strategies and hardening techniques that security professionals can implement to strengthen physical access controls. Gain insights from a principal researcher at GGR Security who specializes in penetration testing locks, alarms, and critical infrastructure systems, and serves as Content Director for DEF CON's Physical Security Village.