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Pseudonymization and anonymization of data

tekijä: taantamm — Viimeisin muutos lauantai 23. heinäkuuta 2022, 11.26


keha_prosessi focusing_and_justifying_study research_design doing_research reporting ethics


For research use, personal data can be pseudonymized or anonymized. With pseudonymization, personal data is processed so that it can no longer be linked to a particular person without further information. Additional information, on the other hand, must be kept separately from personal data at all times. Pseudonymization can be accomplished, for example, by using aliases of persons or encoding personal data. Combining encoded data with a particular person requires a code key. A person with this code key can decrypt the material and re-identify each participant registered in the data. For this reason, pseudonymised personal data remains personal data subject to the data protection regulations.

After anonymization, the person can no longer be identified. For example, data can be changed to a statistical format so that individuals can no longer be identified from the data. Anonymised information is no longer personal data and is therefore not subject to the data protection regulations.


Read more on the topic:

Office of the Data Protection Ombudsman. Scientific research and data protection, 2021.

University of Jyväskylä. Data Privacy. Instructions for researchers, 2021.

University of Jyväskylä. Data privacy. Instructions for students, 2021.