--- AWSTemplateFormatVersion: '2010-09-09' Description: Create an S3 Bucket with KMS Encryption Resources: ConfigBucket: Type: AWS::S3::Bucket Properties: BucketEncryption: ServerSideEncryptionConfiguration: - ServerSideEncryptionByDefault: KMSMasterKeyID: !Sub arn:aws:kms:${AWS::Region}:${AWS::AccountId}:alias/aws/s3 SSEAlgorithm: aws:kms AccessControl: BucketOwnerFullControl