Amazon S3 offers two ways to set up default encryption for objects in a bucket:
- Default Encryption: You can use the Default Encryption feature to set up default encryption for all objects that are added to a bucket. When you enable Default Encryption, Amazon S3 automatically encrypts all objects that are added to the bucket using the specified encryption method (such as AES-256). Details in this link
- Bucket Policy: You can use a Bucket Policy to specify encryption requirements for objects in a bucket. For example, Bucket Policy can be seet to require that all objects in the bucket are encrypted using AES-256, or to allow only certain encryption methods to be used. Details in this link
Both Default Encryption and Bucket Policies can be used to enforce encryption requirements for objects in a bucket. Default Encryption is a bucket-level setting that is applied to all objects in the bucket, while a Bucket Policy is a document that defines the encryption requirements for objects in the bucket.
Here are a few key differences between Default Encryption and Bucket Policies:
- Scope: Default Encryption is applied to all objects in a bucket, while a Bucket Policy can be more granular and apply to only certain objects in the bucket (for example, objects with a certain prefix or tag).
- Inheritance: Default Encryption is inherited by all objects in a bucket, even if they are copied or moved to another bucket. A Bucket Policy, on the other hand, applies only to the objects in the bucket where the policy is defined.
- Overrides: Default Encryption can be overridden by an object-level encryption setting, while a Bucket Policy cannot be overridden by an object-level setting.
