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Interview question · Cryptography, PKI & TLS

What does TLS not protect, even when it is configured perfectly?

TLS protects bytes on the wire between two endpoints. The scored answer lists what lies outside that boundary, so nobody mistakes 'we use HTTPS' for a security design.

mediumNewPreparation tags: Google, Microsoft, AmazonUpdated Nov 2026

TLS protects bytes on the wire between two endpoints. The scored answer lists what lies outside that boundary, so nobody mistakes 'we use HTTPS' for a security design.

Make your first attempt

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 team assumes TLS makes their API secure because all traffic is encrypted.

  1. What does TLS provide?
  2. What does it not protect at the endpoints?
  3. Does TLS make content safe?
  4. What metadata remains visible?
  5. What about authorisation?
  6. How would you correct the assumption?

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.

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