A quasi identifier, also known as ‘Indirect identifier’, is a piece of information that does not itself identify an individual, but can do so when combined with other quasi-identifiers (e.g. date of birth; zip or postcode; location data; salary).
Quasi-identifiers are a big privacy issue, as a seemingly privacy-safe dataset can expose individuals when combined with another dataset containing information about the same individual (e.g. from the public domain).
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