You can encrypt stored objects if you want to ensure that data cannot be retrieved in a readable form if an object store is compromised. By default, objects are not encrypted.
Stored object encryption enables the encryption of all object data as it is ingested through S3 or Swift. When you enable the setting, all newly ingested objects are encrypted but no change is made to existing stored objects. If you disable encryption, currently encrypted objects remain encrypted but newly ingested objects are not encrypted.
Stored objects can be encrypted using the AES‐128 or AES‐256 encryption algorithm.
For S3 objects, the Stored Object Encryption setting can be overridden by the x-amz-server-side-encryption header. If you use the x-amz-server-side-encryption header, you must specify the AES-256 encryption algorithm in the request.