AWS Storage Gateway User Guide
Encrypting Your Data Using AWS KMS
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Encrypting Your Data Using AWS Key Management
Service
AWS Storage Gateway uses SSL/TLS (Secure Socket Layers/Transport Layer Security) to encrypt data
that is transferred between your gateway appliance and AWS storage. By default, Storage Gateway uses
Amazon S3-Managed Encryption Keys (SSE-S3) to server-side encrypt all data it stores in Amazon S3.
You have an option to use the Storage Gateway API to configure the different gateway types to encrypt
data stored in the cloud using the AWS Key Management Service (KMS).
Encrypting a File Share
For a file share, you can configure your gateway to encrypt your objects with AWS KMS–managed keys by
using SSE-KMS. For information on using the Storage Gateway API to encrypt data written to a file share,
in the
AWS Storage Gateway API Reference
.
Encrypting a Volume
For cached and stored volumes, you can configure your gateway to encrypt volume data stored in
the cloud with AWS KMS–managed keys by using the Storage Gateway API. You can specify one
of the managed customer master keys (CMKs) as the KMS key. The CMK that you use to encrypt
your volume can't be changed after the volume is created. For information on using the Storage
Gateway API to encrypt data written to a cached or stored volume, see
or
in the
AWS Storage Gateway API Reference
.
Encrypting a Tape
For a virtual tape, you can configure your gateway to encrypt tape data stored in the cloud with AWS
KMS–managed keys by using the Storage Gateway API. You can specify one of the managed customer
master keys (CMKs) as the KMS key. The CMK that you use to encrypt your tape data can't be changed
after the tape is created. For information on using the Storage Gateway API to encrypt data written to a
AWS Storage Gateway API Reference
.
When using AWS KMS to encrypt your data
,
keep the following in mind:
• Your data is encrypted at rest in the cloud. That is, the data is encrypted in Amazon S3.
• IAM users must have the required permissions to call the AWS KMS API operations. For more
Using IAM Policies with AWS KMS
in the
AWS Key Management Service Developer
Guide
.
• If you delete or disable your CMK or revoke the grant token, you can't access the data on the volume
or tape. For more information, see
AWS Key Management Service
Developer Guide
.
• If you create a snapshot from a volume that is KMS-encrypted, the snapshot is encrypted. The
snapshot inherits the volume's KMS key.
• If you create a new volume from a snapshot that is KMS-encrypted, the volume is encrypted. You can
specify a different KMS key for the new volume.
Note
AWS Storage Gateway doesn't support creating an unencrypted volume from a recovery point
of a KMS-encrypted volume or a KMS-encrypted snapshot.
For more information about AWS KMS, see
What is AWS Key Management Service?
API Version 2013-06-30
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