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Interview question · Cryptography, PKI & TLS

What problem does Certificate Transparency solve, and how would you use it defensively?

Any trusted CA can issue a certificate for your domain. The scored answer explains how public logs make that visible and how to turn the logs into an alert.

mediumNewPreparation tags: Google, Salesforce, MicrosoftUpdated Nov 2026

Any trusted CA can issue a certificate for your domain. The scored answer explains how public logs make that visible and how to turn the logs into an alert.

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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 security team wants to know whenever a certificate is issued for the company's domains, after a phishing site used a look-alike certificate.

  1. Why is certificate issuance a risk at all?
  2. What is Certificate Transparency?
  3. How do you use CT for monitoring?
  4. What does CAA add?
  5. What do you do when an unexpected certificate appears?
  6. What programme would you set up?

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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