AWS Storage Blog
Author: Andrew Guthrie
Andrew Guthrie is an Systems Dev Engineer on the Amazon S3 team at AWS. He spends his days working the S3 service and working with S3 Customers. Prior to coming to AWS, Andrew served in the United States Coast Guard.
Encrypting existing Amazon S3 objects with the AWS CLI
February 5, 2026: Amazon S3 now supports the UpdateObjectEncryption API so you can atomically update the server-side encryption type of existing encrypted objects from server-side encryption with S3 managed encryption (SSE-S3) to server-side encryption with AWS Key Management Service (AWS KMS) encryption keys (SSE-KMS). Read the documentation. Encryption of data at rest is increasingly required […]