Pseudonymization
Definition
Pseudonymization replaces direct assignments with separately protected additional information.
The processing of personal data so that it can no longer be attributed to a person without separately stored additional information.
Simply explained
A name is replaced, for example, by an identifier; the list for re-identification remains separate.
Why it matters in practice
The term supports companies in selecting technologies sensibly, anchoring them organizationally, and using them competently.
Example from business
Customer names are replaced by tokens; mapping keys are stored separately and strictly protected.
Limits and pitfalls
- Treating pseudonymized data as anonymous or ignoring indirect identifiers.
Origin & history
The GDPR explicitly defines pseudonymization in Article 4, number 5.
Use in mid-sized companies
- Possible application: Customer names are replaced by tokens; mapping keys are stored separately and strictly protected.
Frequently asked questions
What does pseudonymization mean?
The processing of personal data so that it can no longer be attributed to a person without separately stored additional information. What mistakes should be avoided? Treating pseudonymized data as anonymous or ignoring indirect identifiers.
Sources
Source checked on 10.10.2026. Editorial application examples are hypothetical; no evidence of real customer results.
Editorially reviewed on: