A health organization experienced a breach of a database containing pseudonymized personal data.

Pseudonymization is a technique that replaces or removes direct identifiers from personal data, such as names, addresses, or social security numbers, with pseudonyms, such as codes, tokens, or random values. However, pseudonymization does not eliminate the possibility of re-identification, as the original data can still be linked back to the pseudonyms using additional information or techniques. Therefore, if a database containing pseudonymized personal data is breached, the IT privacy practitioner should be most concerned about the risk of re-identification, which could compromise the privacy and security of the data subjects. The other options are less relevant or important than the risk of re-identification.

References: CDPSE Review Manual, 2021, p. 62