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Interview question · Mobile Application Security

How is certificate pinning bypassed on a device the tester controls, what does that prove, and how do apps and backends resist?

Pinning protects the user from the network. It was never going to protect your API from the person holding the phone, and the good answer explains both halves.

hardEssentialNewPreparation tags: Google, Apple, JPMorgan ChaseUpdated Nov 2026

Pinning protects the user from the network. It was never going to protect your API from the person holding the phone, and the good answer explains both halves.

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

During an authorised test of a banking app, you need to inspect API traffic, and the app pins its certificate.

  1. Where can pinning be defeated on a controlled device, conceptually?
  2. What does a successful bypass prove?
  3. How can apps resist bypass better?
  4. What should the test focus on once traffic is visible?
  5. What must stay in scope?
  6. How would you run and report this part of the test?

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
Next in this trackWalk through Android's Network Security Configuration and iOS App Transport Security: what each controls, defaults and risky settings.Next in this trackHow do hardware-backed keys work on Android and iOS, what does key attestation prove, and why must biometrics unlock a key, not a boolean?Next in this trackHow are mobile apps signed and verified: APK signature schemes and key rotation, and iOS certificates, profiles and entitlements?
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