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Pseudonymous Identifier

Privacy

Tracking Pseudonymization Advertising ID Alias

Identifier not directly revealing identity but linkable to a subject over time; often reversible via lookup.

Definition

A pseudonymous identifier is a stable ID that does not directly include identity (name/email), but can be linked back via additional data (account mapping) or correlated patterns. It supports tracking and profiling.

In plain English Identifier not directly revealing identity but linkable to a subject over time; often reversible via lookup.

Why this matters

Why it matters: Pseudonymous IDs still count as personal data in many regimes because they can be linked to a person.

Example

Example: Replace raw account IDs with rotating per-service IDs to reduce linkability and limit re-identification pathways.