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User Encryption

Updated on 2024-04-15 GMT+08:00

User encryption allows you to use the encryption feature provided on the cloud platform to encrypt ECS resources, improving data security. User encryption includes image encryption and EVS disk encryption.

Image Encryption

Image encryption supports encrypting private images. When creating an ECS, if you select an encrypted image, the system disk of the created ECS is automatically encrypted, improving data security.

Use either of the following methods to create an encrypted image:

  • Use an external image file.
  • Use an existing encrypted ECS.

For more information about image encryption, see Encrypting Images.

EVS Disk Encryption

EVS disk encryption supports system disk encryption and data disk encryption.

  • When creating an ECS, if you select an encrypted image, the system disk of the created ECS automatically has encryption enabled, and the encryption mode complies with the image encryption mode.
  • When creating an ECS, you can encrypt its system disk.
  • When creating an ECS, you can encrypt added data disks.

For more information about EVS disk encryption, see EVS Encryption.

Impact on AS

If you use an encrypted ECS to create an Auto Scaling (AS) configuration, the encryption mode of the created AS configuration complies with the ECS encryption mode.

About Keys

The key required for encryption relies on Data Encryption Workshop (DEW). DEW uses a data encryption key (DEK) to encrypt data and uses a customer master key (CMK) to encrypt the DEK.

Figure 1 Data encryption process

Table 1 describes the keys involved in the data encryption process.

Table 1 Keys

Name

Description

Function

DEK

An encryption key that is used for encrypting data.

Encrypts specific data.

Custom key

An encryption key created using DEW for encrypting DEKs.

A custom key can encrypt multiple DEKs.

Supports CMK disabling and scheduled deletion.

Default key

A master key automatically generated by the system when you use DEW for encryption for the first time.

The name extension of a default CMK is /default, for example, evs/default.

  • Supports query of the default key on the DEW console.
  • Does not support CMK disabling or scheduled deletion.
NOTE:

After disabling a CMK or scheduling the deletion of a CMK takes effect, the EVS disk encrypted using this CMK can still be used until the disk is detached from and then attached to an ECS again. During this process, the disk fails to be attached to the ECS because the CMK cannot be obtained, so the EVS disk becomes unavailable.

For details about DEW, see Data Encryption Workshop User Guide.

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