Whitelisting

A list of discrete entities, such as hosts or applications that are known to be benign and are approved for use within an organization and/or information system. 

See the following for more information: 
NIST SP 800-128 under Whitelist (NIST SP 800-94 – Adapted).
NIST SP 800-82 Rev. 2 under Whitelist (NIST SP 800-128).

NIST SP 800-179 under Whitelist (NISTIR 7298 Rev. 2).
 

The process used to identify:  

(i) software programs that are authorized to execute on an information system; or  

(ii) authorized Universal Resource Locators (URL)/websites. 

See the following under Whitelisting for more information: 

NIST SP 800-171 Rev. 2.  
NIST SP 800-53 Rev. 4.  

An approved list or register of entities that are provided a particular privilege, service, mobility, access or recognition. 

See NISTIR 7621 Rev. 1 under Whitelist for more information.