Quasi-Identifier
Technical
An attribute that is not unique by itself but, in combination with other attributes, can re-identify an individual. ZIP code, birth date, and gender alone re-identify roughly 87% of the U.S. population.
See also
- K-AnonymityA privacy model that ensures each record in a release is indistinguishable from at least k-1 others on quasi-identifiers, reducing re-identification risk.
- Re-Identification RiskThe probability that a de-identified or anonymized record can be matched back to a real individual using external data or inference.
- Indirect IdentifierA data element that does not identify a person on its own but contributes to identification in combination with others: ZIP code, birth date, gender, employer.
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