AO Archive: Encrypting Your Existing AWS S3 Objects
https://spin.atomicobject.com/2020/09/15/aws-s3-encrypt-existing-objects/
This is a blog post I wrote while working at Atomic Object. As the title says, it’s a guide to encrypting objects that are already in S3. The process is similar to the one described in this post from the AWS Security Blog, only it involves fewer moving parts and is intended for a simpler situation.