Understanding the UEFI Secure Boot Chain
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Understanding the UEFI Secure Boot Chain
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Understanding UEFI Secure Boot Chain
Executive Summary
Overview
Secure Boot Chain in UEFI
UEFI Secure Boot
Intel® Boot Guard
Boot Chain – Putting it all together
Signed Capsule Update
Signed Recovery
S3 Resume
SMM Runtime Communication
Additional Secure Boot Chain Implementations
Looking Forward – Platform Firmware Resiliency
Glossary
References
Figures
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Boot Chain – Putting it all together
Figure 2-5 shows a complete secure boot chain constructed using Intel® Boot Guard, OBB Verification, and UEFI Secure Boot.

Figure 2-5: Secure Boot Verification Flow

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Signed Capsule Update
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Figure 2-5: Secure Boot Verification Flow