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Interview question · Adversarial ML & Model Privacy

Explain differential privacy in plain terms. What do epsilon and delta mean?

The guarantee is about what an observer can learn from your presence in the data, not about hiding the data. Epsilon bounds it; delta is the small print.

mediumNewPreparation tags: Apple, Google, MetaUpdated Nov 2026

The guarantee is about what an observer can learn from your presence in the data, not about hiding the data. Epsilon bounds it; delta is the small print.

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 product manager asks what differential privacy means in plain words, because the team is considering it for analytics on user behaviour and for training a recommendation model.

  1. What does differential privacy promise?
  2. What do epsilon and delta mean?
  3. How is it achieved in practice?
  4. What if the team runs many analyses on the same data?
  5. When is differential privacy the wrong tool?
  6. How would you explain the decision to the product manager?

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.

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