Transparent Data Encryption(TDE) is available in other databases, for example in MSQL, see Transparent data encryption (TDE) fro details.
Currently it is not available in Greenplum or Postgres (which Greenplum is based on).
As of October 2025, the only encryption available with Greenplum is pgcrypto which encrypts columns or tables in the the database.
There are plans to introduce TDE in Greenplum 7.7.0 by the end of 2025.
This is the current plan, but it may change depending on testing and verification.