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    Glossary
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security service

Definitions:

  A capability that supports one, or many, of the security goals. Examples of security services are key management, access control, and authentication.
Sources:
CNSSI 4009-2015

  A processing or communication service that is provided by a system to give a specific kind of protection to resources, where said resources may reside with said system or reside with other systems, for example, an authentication service or a PKI-based document attribution and authentication service. A security service is a superset of AAA services. Security services typically implement portions of security policies and are implemented via security mechanisms.
Sources:
NIST SP 800-95 under Security Service from Web Services Glossary - W3C Working Group Note 11 February 2004

  Mechanisms used to provide confidentiality, identity authentication, integrity authentication, source authentication, and/or support the non-repudiation of information.
Sources:
NIST SP 800-57 Part 1 Rev. 5 under Security services

  A security capability or function provided by an entity that supports one or more security objectives.
Sources:
NIST SP 800-53 Rev. 5

  A security capability or function provided by an entity.
Sources:
NIST SP 800-160v1r1