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Governance, Risk, Audit & Privacy · Intermediate

Pseudonymization

Processing personal data so it cannot be attributed to an individual without separately kept additional information.

Definition

Pseudonymization replaces identifiers with tokens or keyed hashes while keeping the re-identification key separate and protected. GDPR treats pseudonymized data as personal data but recognizes it as a security and data protection by design measure. It supports analytics with lower risk.

Example

Patient names are replaced with random study IDs, with the mapping table held by a separate team.

Exam tip

Pseudonymized data is still personal data; anonymized data is not.

Don't confuse it with

Related terms