Encryption Matrix

Prerequisites

Portworx Backup allows you to enable two types of encryption, one for the backup data at rest in the destination and the other for the backups in transit. For the resting backup data, Portworx Backup utilizes AWS SSE-S3 encryption support provided by AWS S3. Following topics provide more information on these two kinds of encryption:

Server-side encryption (SSE-S3)

Prerequisites

• Portworx Backup 2.7.0 and above
• Portworx 3.1.0 and above
• Stork 24.1.0

AWS S3 encrypts the backup data at the destination either with the applications or the services that receive the data. By default, all AWS S3 buckets are configured with encryption. For more information, refer AWS S3 SSE.

Following table explains the encryption support for the backup types provided by Portworx Backup and their behavior: Portworx Backup currently supports the following type of encryption:

• SSE-S3 with AWS S3 managed keys

In this type of encryption, each object is encrypted with unique key. To provide enhanced security, the SSE-S3 encrypts the unique encryption key itself using a root key with a regular rotational mechanism.

You can enable SSE-S3 for the following backup types of Portworx Backup:

• Backups based on Portworx volumes
• CSI backups
• CSI backup with offload to backup location (KDMP)
• KDMP backups

For more information on how to enable this encryption, refer Add AWS/S3 backup location

Following table describes the server side encryption behavior of Portworx Backup with the bucket configuration and deny policy:

Bucket configuration	Deny policy configuration	SSE-S3 enabled	Portworx Backup behavior
SSE-S3	No	No	Backup location gets created Backup data is encrypted with default encryption key
SSE-S3	No	Yes	Backup location gets created Backup data is encrypted with default encryption key
SSE-S3	Yes	Yes	Backup location gets created Backup data is encrypted with default encryption key
SSE-S3	Yes	No	Creation of backup location fails with AccessDenied error

Transit data encryption

Prerequisites

• Portworx Backup 2.3.0 and above
• Portworx 2.11.2 and above
• Stork 23.9.1

Following table explains the encryption support for the backup types provided by Portworx Backup and their behavior:

Backup Type	Data Files	Encryption Support	Encryption Key
Backup to Portworx volumes	Data
		Yes	User-provided
	Resource files
		Yes	User-provided
KDMP Backup	Data
		Yes	Volume snapshots are encrypted with default encryption key and not with the user-provided encryption key
	Resource files
		Yes	User-provided
Backup to Cloud providers	Data
		No	-
	Resource files
		Yes	User-provided

note

Portworx Backup encrypts your backups (data and resource files) in-transit regardless of the backup location type (NFS or S3 compliant object store).