Create Encrypted Field Configurations

Configure specific table fields to be encrypted using your External Key Management Service (EKMS) cryptographic module with external Amazon Web Services Key Management System (AWS KMS) key wrapping.

始める前に

Roles required: admin, secuirty_admin, and sn_kmf.cryptographic_manager

Confirm that you have created a cryptographic module with external key wrapping enabled. See Configure an external key definition.

このタスクについて

An Encrypted Field Configuration (EFC) connects a specific table column to your EKMS cryptographic module. EFC creates a secure encryption chain where your data can only be decrypted if both the ServiceNow data encryption key (DEK) and your external AWS key are available.

手順

1. Navigate to All > System Security > Field Encryption > Field Encryption Enterprise > Configurations > Encrypted Fields.
2. Select Create new.
3. Complete the EFC form.

   Field	Description
   Table	Table whose fields or attachments are to be encrypted.
   Type	Column to encrypt a table column or Attachment to encrypt all of a table's attachments. Types of data encrypted are: String text (Full UTF-8) Attachments Date, Date/Time: 注: You can create encrypted field configurations to encrypt existing Date and Date/Time fields. You can add a new encryption configuration to a parent table only. You can’t add a new encryption configuration to a child table. URL HTML Journal Translated
   Active	Select to mark the configuration active. Deselect if the configuration isn’t yet in use.
   Column	Column (field) to be encrypted if you selected column as the type.
   Encrypt by default	Select this option to verify records that fall outside of the defined criteria are still encrypted by the default field encryption module. If you don't select this option, any records that fall outside of the condition builder criteria won't be encrypted.
   Field Encryption module	The cryptographic module that the encrypted field configuration applies to. 注: Verify that you select the crypto module that has the "External wrap key" flag enabled. Using a module without external wrapping encrypts data with ServiceNow's internal keys instead of your AWS KMS key.
   Method	Select Single Module to set the field configuration across one module. Select Multiple Modules for role-based access that spans across more than one cryptographic module. Single Module Use this option to encrypt all attachments using a single module. Your users need access to this module, otherwise they aren't able to upload attachments. Multiple Modules Use this option to enable users to choose a module when uploading attachments. Users with access to one or more modules can select a module to use for encryption. Users with no module access can upload unencrypted attachments.
   Algorithm Encrypted Preserving [read-only]	Indicates if the crypto module that you selected is already configured to support non-deterministic encryption. This means that if the same data is encrypted more than once, the encryption is different each time.

4. Select Save.

タスクの結果

The field's data established by the EFC are encrypted using the Data Encryption Key (DEK) that is wrapped by your AWS KMS key.

次のタスク

Next steps:

• Configure module access policies to control which user roles can view the encrypted data in clear text
• Test access with users who have appropriate roles
• Test that users without appropriate roles can't view the encrypted data

警告:

Without configured module access policies, users might be unable to view the encrypted data, or access might be unrestricted depending on your system configuration. Configure access policies immediately after creating encrypted field configurations.