Pseudonymisation is a method that allows you to switch the original data set (for example, e-mail or a name) with an alias or pseudonym, or, in other words, a value which does not allow the individual to be directly identified1. It is a reversible process that de-identifies data but allows the re-identification later on if necessary1. This is a well-known data management technique highly recommended by the General Data Protection Regulation (GDPR) as one of the data protection methods2. To make personal data pseudonymous, a data controller must separately hold any information that would allow linking the data to the data subject, such as a key or a code, and ensure that this information is kept securely and subject to technical and organisational measures to prevent unauthorised access or re-identification23. The other options are not correct, as they either describe other data protection methods, such as encryption or anonymisation, or do not meet the definition of pseudonymisation under the GDPR. References: Pseudonymization according to the GDPR, Pseudonymisation - Wikipedia, Anonymisation and pseudonymisation | Data Protection Commissioner
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