Figure 1-1: Clark-Wilson model, From Lee

Figure 2-1: UEFI Secure Boot

Figure 2-2: Image Verification flow

Figure 2-3: Image Verification with timestamp signature database

Figure 2-4: Intel® Boot Guard diagram credit CYBER-RESILIENCY IN CHIPSET AND BIOS

Figure 2-5: Secure Boot Verification Flow

Figure 3-1: Linux MOK Boot, source: UEFI Secure Boot Webinar

Figure 3-2: coreboot Verified Boot

Figure 3-3: Android Verified Boot 1.0 without A/B source: Android Verified Boot 2.0

Figure 3-4: Android Verified Boot 1.0 with A/B source: Android Verified Boot 2.0

Figure 3-5: Android Verified Boot 2.0 source: Android Verified Boot 2.0

Figure 4-1: Component and Trust Chain, from NIST SP800-193

Figure 4-2: High-level View of PCIe® Component Authentication

Figure 4-3: Cerberus power on sequence source: “Project Cerberus Hardware Security

Figure 4-4: Cerberus boot flow source: “Project Cerberus Hardware Security"

Figure 4-5: Cerberus recovery flow source: “Project Cerberus Hardware Security"

Figure 4-6: Cerberus firmware update source: “Project Cerberus Hardware Security"

Figure 4-7: Intel® PFR Overview source: csdn.net

Figure 4-8: Intel® PFR boot flow source: csdn.net

Figure 4-9: Intel® PFR Reset Sequence source: csdn.net

Figure 4-10: Titan System Integration

Figure 4-11: Titan Verified Boot

Figure 4-12: Lattice PFR source: latticesemi.com/pfr