What is Measured Boot?
Quick note explaining Measured Boot for BIOS/UEFI and embedded firmware readers.
What is Measured Boot?
Measured Boot records measurements of boot components into TPM PCRs and an event log.
Why it matters
- Explains firmware trust and protection mechanisms.
- Helps debug Secure Boot, measured boot, and variable-protection behavior.
- Useful when reviewing boot security policy.
Practical example
Example: Secure Boot decides whether an image is allowed to run; Measured Boot records what actually ran.
Quick checklist
- Which policy or key database is involved?
- Is the image/variable signed or measured as expected?
- Do logs report authentication, measurement, or access-denied errors?
Quick takeaway
Measured Boot is a small concept, but it often becomes important when reading logs or debugging real firmware.
Related notes
- What is TPM PCR?
- What is TPM Event Log?
- What is TPM2 ACPI Table?
- What is SMM Lock?
- What is Secure Boot Keys?
Public references
- UEFI Specification 2.11 — Boot Manager
- UEFI Specification 2.11 — Secure Boot / Security
- EDK II SecurityPkg
Found this useful?
Save it or share it with someone learning firmware, BIOS/UEFI, and embedded systems.
Nội dung liên quan
Một số bài viết, ghi chú hoặc project có liên quan đến nội dung bạn vừa đọc.
What is TPM PCR?
Quick note explaining TPM PCR for BIOS/UEFI and embedded firmware readers.
What is Authenticated Variable?
Quick note explaining Authenticated Variable for BIOS/UEFI and embedded firmware readers.
What is Secure Boot Keys?
Quick note explaining Secure Boot Keys for BIOS/UEFI and embedded firmware readers.
Biến note thành bài viết hoàn chỉnh
Notes là nơi ghi nhanh khái niệm.