A. Use envelope encryption with the AWS-managed CMK aws/s3.
B. Create a customer-managed CMK with a key policy granting ג€kms:Decryptג€ based on the ג€${aws:username}ג€ variable.
C. Create a customer-managed CMK for each user. Add each user as a key user in their corresponding key policy.
D. Change the applicable IAM policy to grant S3 access to ג€Resourceג€: ג€arn:aws:s3:::examplebucket/${aws:username}/*ג€