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Security Fundamentals & Crypto · Advanced

Measured Boot

Boot process that records hashes of each component into the TPM so the boot state can be verified later.

Definition

Measured Boot extends cryptographic measurements of firmware, bootloader, drivers, and boot configuration into TPM PCRs. It does not block anything itself but enables remote attestation and sealing of keys to a known-good state. It complements Secure Boot.

Example

Microsoft Intune device health attestation checks Measured Boot logs before marking a device compliant.

Exam tip

Measured Boot = record; Secure Boot = enforce.

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