The process by which an entity (such as a person or computer system) determines whether another entity is who it claims to be. Authentication identified as an individual based on some credential; i.e. a password, biometrics, etc. Authentication is different from authorization. Proper authentication ensures that a person is who he or she claims to be, but it says nothing about the access rights of the individual.
Reference(s) in IAPP Certification Textbooks: F94-95, 124, 128; C59
Associated term(s): Authorization