Definitions
===========

* **Authentication** - The act of proving the identity of a computer system user.

* **Multi-factor authentication (MFA)** - An authentication method in
  which the user is granted access only after successfully presenting
  two or more pieces of evidence (factors). Those can be something the
  user knows (passwords, security questions, etc...), something they
  have (bank card, USB security key, etc...), something they are
  (fingerprint, eye iris, etc..) or somewhere they are (GPS location,
  known WiFi connection, etc...).

* **Finite state machine** -

* **Stage** -

* **Flow** -

* **Plugin** -

* **Operation** -  
