Amazon RDS Update – Data at Rest Encryption using AWS KMS Keys
You can now encrypt your Amazon RDS for SQL Server and Amazon RDS for Oracle databases using keys that you manage through AWS Key Management Service (KMS) (this feature was already available for Amazon RDS for MySQL and Amazon RDS for PostgreSQL).
The encryption applies to data at rest on the underlying storage for the database instance, as well as to automated backups, read replicas, and snapshots. It is applied transparently and you don’t need to make any changes to your application. You can enable encryption and choose your keys (or create new ones) when you create a new database instance:
Amazon RDS encryption can be used concurrently with the Transparent Data Encryption (TDE) option that is already available for Oracle and SQL Server.