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AI Security

Interview question · Mobile Application Security

Beyond storage, where does sensitive data leak from a mobile app, and how do you find and close each leak?

The token is safely in the Keychain, and also in the crash log, the analytics payload and the app-switcher screenshot. Interviewers want the list of side doors, not the front door again.

mediumNewPreparation tags: Apple, Google, MetaUpdated Nov 2026

The token is safely in the Keychain, and also in the crash log, the analytics payload and the app-switcher screenshot. Interviewers want the list of side doors, not the front door again.

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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 mobile pentest finds account numbers and tokens in logs, crash reports and screenshots that the app's developers never intended to store.

  1. Where do mobile data leaks usually happen?
  2. How do you stop logging leaks?
  3. What about third-party SDKs?
  4. How do you protect screens and clipboard?
  5. How do you keep it from coming back?
  6. How would you fix the leaks?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Sign in free to open it.

UP NEXT ON YOUR JOURNEY
Next in this trackThreat-model a mobile banking app. Which controls belong on the device, and which must stay on the server?Next in this trackShould a mobile app pin certificates? If so, what do you pin, and how do you rotate keys without breaking the fleet?Next in this trackIn an authorised mobile pentest, how do you assess certificate pinning and TLS validation, and how do you report what you find?
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