15. Authentication
Authentication is used to verify the identity of a user.
When a user logs in, it is necessary to verify that the person is who they claim to be.
There are three common methods of authentication:
- Something you know: Passwords or passphrases.
- Something you have: Tokens, memory cards, or smart cards.
- Something you are: Biometrics or other measurable characteristics.
These can be used to verify the identity of the user.