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Interview question · Mobile Application Security

How do iOS exploit chains and jailbreaks work at a high level, and what do PAC, BlastDoor and Lockdown Mode do to stop them?

iOS has fewer ways in than most platforms, so attackers aim at the few that remain: messages, the browser and the kernel. Apple's defences are built around those exact paths.

hardNewPreparation tags: Apple, Google, MetaUpdated Nov 2026

iOS has fewer ways in than most platforms, so attackers aim at the few that remain: messages, the browser and the kernel. Apple's defences are built around those exact paths.

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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.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A journalist on your staff fears targeting by commercial spyware on their iPhone.

  1. How does iOS limit attacks?
  2. What does a typical spyware chain involve?
  3. What does Lockdown Mode do?
  4. What else should the journalist do?
  5. What if they suspect compromise?
  6. What would you advise?

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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