CAS-004 Security Engineering Practice Question
A company is implementing measured boot using TPM 2.0. What is the primary purpose of storing boot measurements in Platform Configuration Registers (PCRs)?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
To enable remote attestation of the system's boot state.
PCRs store hashes of boot components; these measurements are used for remote attestation to verify the integrity of the boot process.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To speed up the boot process.
Why it's wrong here
Measurements add overhead, not speed.
- ✗
To provide a root of trust for storage (sealed storage).
Why it's wrong here
While PCRs can be used for sealing, the primary purpose of measurements is attestation.
- ✗
To encrypt the bootloader.
Why it's wrong here
PCRs store measurements, not encryption keys.
- ✓
To enable remote attestation of the system's boot state.
Why this is correct
Attestation allows a verifier to check that the system booted with trusted software.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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