Authentication verifies the identity of the subject (user or program) which is performing by analysis of the identifier presented by the subject and confirmation of its authenticity. Authentication can be based on one or more factors:
- Knowledge: information the subject knows, such as a password or an
- answer to a special question.
- Possession: something the subject has, which could be a link, token, browser cookie, or a private key.
- Inherence: something the subject embodies, including biometrics such as fingerprints, voice or face recognition, retinal scans, movement patterns.
- Location: information about the place where the subject is physically.
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