ebs storage?
That's more of an AWS question rather than a Postgres question... Anyway, in short (and simplified) form: If you're on RDS then RDS takes care of encrypting the underlying EBS storage. And it uses KMS for this - so key management etc. are the same as on other services that use KMS. You probably confused that with encryption *within* the database (not on the storage level). This can be done on column level; check the pg docs for this: https://www.postgresql.org/docs/current/encryption-options.html
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