Methods of Authentication
This article calls the authentication factors we are familiar with the ownership factor, knowledge factor, and inherence factor. These names relate to something you have, something you know, and something you are, respectively.
System Fundamentals For Cyber Security/Authentication/Methods of Authentication
Multi-Factor Authentication
Multi-factor authentication is an approach to authentication which requires two or all of the three authentication factors. Multi-factor authentication can drastically reduce the chance that an attacker accesses a protected resource or account
because the victim's password would no longer be enough to give the attacker access to that resource. A common example of this is single-use passwords used by many web services. A user can request a single-use password, which will be forwarded to the
user's mobile phone or another device so the device is needed in order to obtain the password. This involves both the ownership and knowledge factors.