Currently, FDB does not seem to support data at rest (the stored data on file) encryption. Is there any plan to support this feature?
There are some discussions about this topic before, which is complicated because of utility (who needs it), technicality (key management, API changes, performance), and resource (who implements it). Right now, there is no plan for this feature.
Yes, the work to add FDB native encryption data at-rest is in-progress. Please follow FDB native Encryption data at-rest for more details.