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Training Camp • Cybersecurity Glossary
Re-identification is matching anonymized data back to individuals using auxiliary data, a key privacy risk countered by differential privacy.
Re-Identification Definition: Re-identification is matching anonymized data back to individuals using auxiliary data, a key privacy risk countered by differential privacy.
Re-identification is the process of matching supposedly anonymized or de-identified data back to the specific individuals it describes, typically by correlating it with auxiliary data sources or exploiting unique combinations of attributes. It demonstrates that removing direct identifiers alone is often insufficient for privacy, since quasi-identifiers like ZIP code, birth date, and gender can uniquely single out people. Re-identification risk is a central concern in privacy engineering and drives the use of stronger techniques such as k-anonymity, differential privacy, and data minimization.
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