Column Level Encryption Enterprise

Column Level Encryption Enterprise uses the Key Management Framework (KMF) to enable you to customize and manage how fields and attachments are encrypted and decrypted on your instance. A subscription is required to use Column Level Encryption Enterprise.

Important:

Starting with the Zurich release, Column Level Encryption (CLE) and Column Level Encryption Enterprise (CLEE) are being prepared for future deprecation. They will be hidden and no longer activated on new instances but will continue to be supported. Field Encryption and Field Encryption Enterprise provide the latest experience for this functionality.

For details, see the Deprecation Process [KB0867184] article in the Now Support knowledge base.

Column Level Encryption Enterprise is premised with Column Level Encryption and uses the Key Management Framework and its full support of key management functions. Column Level Encryption Enterprise provides key-protection and key life-cycle management for application-level field encryption. All keys are protected with a key-wrapping hierarchy ultimately rooted in FIPS (Federal Information Processing Standards) 140-2-L3 Hardware Security Modules (HSM).

Important:

This topic covers the enterprise version of Column Level Encryption. For information on the standard version of Column Level Encryption, or to learn the differences between the two versions, see Exploring Column Level Encryption.

Column Level Encryption Enterprise gives you the ability to manage how supported fields are encrypted and decrypted in accordance with NIST 800-57 practices. It also uses the most updated version of field-level encryption, including integration for proper key protection and management.

Specifically, Column Level Encryption Enterprise uses the KMF encryption modules, granting you more control of server-side encryption. KMF verifies proper data encryption key protection using key hierarchy and envelope encryption. Your instance encrypts data through cryptographic modules that you configure. You can create an access policy for each module then configure cryptographic specifications and access policies and control key life-cycle management control.

Column Level Encryption Enterprise supports module access policies based on:

• Scope
• Role
• Script
• Resource Exchange
• System User

See Create a module access policy for additional information.

Note:

For details on the supported features of Column Level Encryption and how to upgrade and subscribe to the Column Level Encryption Enterprise entitlement refer to Encryption and Key Management subscription bundle.

Encryption terms

Term	Description
Figure 1. Key management	Support for key management Fundamental to Column Level Encryption Enterprise is the Key Management Framework (KMF). Gain the following capabilities: Key life-cycle management. Key rotation. See Rotate keys for details. Key protection and key generation with FIPS 140-2-L3 Hardware Security Modules (HSMs). Segregation of roles and duties. The secure transfer of data encryption keys between instances, such as production and non-production instances. Customer Supplied Keys (CSK) with key-wrapping. Non-deterministic encryption. Mass encryption/decryption. Auditing of key access/use. See Key Management Framework Reference for details.
Figure 2. Customer-supplied key	Support for customer supplied keys One of the biggest benefits of Column Level Encryption Enterprise is that you can use your own keys for encryption. Administrators have the choice to use ServiceNow supplied keys or your own customer-supplied keys (CSK) for encryption on the ServiceNow AI Platform®. You can also manage the key life cycle and decide when to revoke, rotate, and inactivate the keys. After you enable customer-supplied keys and create a cryptographic module, you download a token and public ephemeral key. You use the token and public key to wrap your key and then upload to the instance. To use customer-supplied keys, see Configure field encryption settings to select key type and Using customer supplied keys with Column Level Encryption Enterprise.
Figure 3. Column Level Encryption	Support for both field encryption and attachment encryption Both field encryption and attachment encryption use cryptographic modules and access policies through Encrypted Field Configurations. The Encrypted Field Configuration form is used to choose an encryption type of column or attachment encryption. See Set encrypted field configurations for more information and supported field types.
Figure 4. Non-deterministic encryption	Support for non-deterministic encryption Column Level Encryption Enterprise supports non-deterministic encryption for enhanced security. If the system encrypts the same data more than once, the ciphertexts are different each time. Non-deterministic encryption is available with Advanced Encryption Standard (AES) encryption with Cipher Block Chaining (CBC). You can enable this feature through the Equality Preserving option on the Algorithm Definition stage of the cryptographic specification. Create a cryptographic specification for a crypto module and define an algorithm for encryption and generate the key. See Create a cryptographic module to define the mechanisms used for cryptographic operations and for more information on enabling non-deterministic encryption.
Figure 5. Resource Exchange	Resource Exchange Column Level Encryption Enterprise keys instance to instance in a secure manner using the KMF cryptographic APIs to provide confidentiality, integrity, authentication, and non-repudiation. Resource Exchange is a KMF feature that gives you the capability to exchange resources between instances in a secure manner. See Key Management Framework Resource Exchange for details.

Note:

If you choose not to activate Column Level Encryption Enterprise, you can still use Column Level Encryption. See Exploring Column Level Encryption for information.

Column Level Encryption Enterprise supports on-premise customers. It doesn’t support Domain Separation.

Support for additional encrypted fields

The standard version of Column Level Encryption is limited to five encrypted columns. Column Level Encryption Enterprise supports an unlimited number of encrypted columns.

Supported field information

The following field types can be encrypted:

• Attachments
• Date
• Date/Time
• Email
• HTML
• Journal
• Journal Input
• Journal List
• Phone
• String text
• Translated Field
• Translated HTML
• Translated Text
• URL

Attachment Encryption

Attachment encryption by default

Customers using Column Level Encryption have attachments encrypted by default in tables that have an active Encrypted Field Configuration (EFC) type of Attachment.

This default encryption defined by the EFC configuration means that admins don’t need to manually declare that an attachment should be encrypted on upload for these tables.

Administrators can disallow users from attaching unencrypted files

For details, see Prevent users from attaching unencrypted files.

Opt out of default encryption

If you don’t want attachments encrypted by default based on EFC configuration, you can opt out of this option by contacting ServiceNow support.

To opt out of this feature, create a support case with ServiceNow support, and include this statement in a comment on the case record:

"I [customer name], understand that I am asking ServiceNow to turn off a recommended security best practice for attachments, and that [customer company] assumes any additional risk related to their configuration and use of unencrypted attachments in the ServiceNow application."

API support

Column Level Encryption Enterprise enables the following APIs.

Note:

The API behavior described in the following table represents the default configuration for the latest base system package. If you are working with older package versions, you may experience different functionality.

Table 1. Field Encryption APIs

API	Description	Parameters	Return type
changeEncryptionContext()	Updates an active Encryption Context (EC) used to encrypt an attachment. When CLE is enabled with the CLE Starter plugin using KMF Crypto Module (CM), the API locates the CM for the EC and uses it to encrypt the attachment. Note: This API is only available in the Global scope.	sourceTable – Name of table that has the attachment. sourceID – Table record system id. attachmentID – The sys_attachment record system id. newEncryptionContextID - System ID of the new context.	Boolean
changeCryptoModule()	Updates an active encryption module used to encrypt an attachment. Note: This API is only available in the Global scope.	sourceTable – Name of table that has the attachment. sourceID – Table record system id. attachmentID – The sys_attachment record system id. newCryptoModuleId - System ID of the new encryption module to encrypt the attachment.	Boolean
disableEncryption()	Disable active encryption on an attachment.	sourceTable – Name of table that contains the attachment. sourceID – Table record system id. attachmentID – The sys_attachment record system id.	Boolean
getDisplayValue()	Returns the cleartext display value of an encrypted field.		String
getValue()	Returns the cleartext value of an ecrypted field when glide_encryption.set_value_support_cle.disabled is false (requires Module Access Policy (MAP)). Returns the encrypted value of an encrypted field when glide_encryption.set_value_support_cle.disabled is true.		String
setDisplayValue()	Inserts encrypted data into an encrypted field for display purposes.	name – Field name. value – Field value.	Boolean
setValue()	Inserts encrypted data into an encrypted field, controlled by a system property. Encrypts data when glide_encryption.set_value_support_cle.disabled is false (requires MAP); writes unencrypted data when set to true (no MAP required), when glide_encryption.set_value_support_cle.disabled is true.	name – Field name. value – Field value.	Boolean

The following script illustrates API changes when the Incident short description is encrypted:

var gr = new GlideRecord('incident'); //creates a new incident
gr.setValue('short_description','test123'); //sets the value to test123
var sys_ID = gr.insert(); //inserts the record in the Incident table.
gs.info(gr.getValue('short_description')); //displays the unencrypted value

When the Column Level Encryption plugin is installed, glide_encryption.set_value_support_cle.disabled is set to false by default.