1 / 5
What is the difference between 'anonymisation' and 'pseudonymisation'?
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Pseudonymised data can be re-linked via a key; truly anonymised data cannot be traced back to a person.
2 / 5
'Masking' a credit card to show only the last four digits is an example of what?
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Masking hides part of a field (e.g. ****1234) so the sensitive portion isn't displayed.
3 / 5
What is 're-identification'?
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Re-identification is the risk that supposedly anonymous data can be linked back to individuals.
4 / 5
A dataset satisfies 'k-anonymity' with k=5. What does that ensure?
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k-anonymity means any individual blends into a group of at least k people on identifying attributes.
5 / 5
Which sentence correctly uses 'aggregation' for privacy?
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Aggregation reports group-level statistics, protecting individuals by not exposing single records.