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Interview question · Cryptography, PKI & TLS

Compare hardware roots of trust: TPM, TrustZone, SGX and confidential VMs, Secure Enclave, secure elements and HSMs. What does each stop?

They all promise 'hardware security'. They protect different things from different attackers, and choosing well means knowing who you are defending against.

hardNewPreparation tags: Google, Microsoft, AppleUpdated Nov 2026

They all promise 'hardware security'. They protect different things from different attackers, and choosing well means knowing who you are defending against.

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What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A company wants laptops to prove their boot integrity before accessing internal systems.

  1. What is a TPM, and what does it do?
  2. How does boot attestation work?
  3. How do TrustZone and SGX differ?
  4. What are the practical difficulties?
  5. How would you use it for access?
  6. What would you implement?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
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