How to set up data encryption at rest for S3 buckets?

To set up data encryption at rest for S3 buckets, you can follow the steps below:

1. Open the Amazon S3 console at https://console.aws.amazon.com/s3/.

2. Navigate to the bucket for which you want to enable encryption.

3. Click on the bucket name to go to the bucket properties.

4. Click on the "Properties" tab.

5. Under the "Advanced settings" section, click on "Default encryption".

6. Click on "Edit".

7. Select the encryption type you want to use (e.g. SSE-S3, SSE-KMS).

8. If you choose SSE-KMS, you can select a KMS key or create a new one. If you choose SSE-S3, Amazon manages the encryption keys for you.

9. Click "Save" to apply the encryption settings.

After following these steps, all objects uploaded to the S3 bucket will be automatically encrypted at rest using the selected encryption type. It is important to remember that existing objects in the bucket will not be automatically encrypted, and you will need to manually encrypt them by re-uploading or using the AWS CLI or SDK.