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AI Security

Interview question · Mobile Application Security

An app ships an on-device language model and an AI assistant feature. What new security risks does that create on mobile?

Everything shipped on the phone belongs to the person holding it: the weights, the system prompt and any key the assistant uses. And the assistant now reads notifications, messages and screens written by strangers.

hardNewPreparation tags: Apple, Google, MetaUpdated Nov 2026

Everything shipped on the phone belongs to the person holding it: the weights, the system prompt and any key the assistant uses. And the assistant now reads notifications, messages and screens written by strangers.

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 mobile app ships an on-device image classifier and a small language model with a safety system prompt.

  1. What should you assume about shipped model files?
  2. What does that mean for proprietary value?
  3. What does it mean for safety?
  4. What about the classifier's decisions?
  5. What are the benefits worth keeping?
  6. How would you design the feature?

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