Session 13: Open Portable Trusted Execution Environment (OP-TEE) 

• Introduction to OP-TEE
• Key Features & Architecture
• OP-TEE Build & Deployment

Session 14: SELinux – Security Enhanced Linux 

• Overview of SELinux & Its Purpose
• Enabling SELinux in Embedded Linux Systems
• SELinux Contexts, Labels & User Roles

Session 15: SELinux Policies & Configuration 

• Understanding SELinux Policies
• Creating & Managing SELinux Policies
• Policy Structure & Rule Enforcement
• SELinux Auditing, Logging & Troubleshooting

Session 16: Hands-on Lab – Configuring SELinux for Secure Kernel & User Space