No. The GDPR does not mandate specific security measures. Instead, the GDPR requires organizations to take technical and organizational security measures which are appropriate to the risks presented. Encryption at rest and pseudonymization may be appropriate depending on the circumstances, but they are not mandated by the GDPR in every instance. The following are kinds of security actions considered “appropriate to the risk” (1) the pseudonymization and encryption of personal data (as mentioned); (2) the ability to ensure the ongoing confidentiality, integrity, availability and resilience of processing systems and services; (3) the ability to restore the availability and access to personal data in a timely manner in the event of a physical or technical incident; and (4) a process for regularly testing, assessing and evaluating the effectiveness of technical and organizational measures for ensuring the security of the processing.