ServerSideEncryptionByDefault - Amazon Simple Storage Service
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ServerSideEncryptionByDefault

Describes the default server-side encryption to apply to new objects in the bucket. If a PUT Object request doesn't specify any server-side encryption, this default encryption will be applied. If you don't specify a customer managed key at configuration, Amazon S3 automatically creates an AWS KMS key in your AWS account the first time that you add an object encrypted with SSE-KMS to a bucket. By default, Amazon S3 uses this KMS key for SSE-KMS. For more information, see PUT Bucket encryption in the Amazon S3 API Reference.

Note

If you're specifying a customer managed KMS key, we recommend using a fully qualified KMS key ARN. If you use a KMS key alias instead, then AWS KMS resolves the key within the requester’s account. This behavior can result in data that's encrypted with a KMS key that belongs to the requester, and not the bucket owner.

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SSEAlgorithm

Server-side encryption algorithm to use for the default encryption.

Type: String

Valid Values: AES256 | aws:kms | aws:kms:dsse

Required: Yes

KMSMasterKeyID

AWS Key Management Service (KMS) customer AWS KMS key ID to use for the default encryption. This parameter is allowed if and only if SSEAlgorithm is set to aws:kms or aws:kms:dsse.

You can specify the key ID, key alias, or the Amazon Resource Name (ARN) of the KMS key.

  • Key ID: 1234abcd-12ab-34cd-56ef-1234567890ab

  • Key ARN: arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab

  • Key Alias: alias/alias-name

If you use a key ID, you can run into a LogDestination undeliverable error when creating a VPC flow log.

If you are using encryption with cross-account or AWS service operations you must use a fully qualified KMS key ARN. For more information, see Using encryption for cross-account operations.

Important

Amazon S3 only supports symmetric encryption KMS keys. For more information, see Asymmetric keys in AWS KMS in the AWS Key Management Service Developer Guide.

Type: String

Required: No

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: