Two-factor Authentication

Two-factor authentication (TFA, T-FA or 2FA) is an approach to authentication which requires the presentation of two or more of the three authentication factors: a knowledge factor ("something the user knows"), a possession factor ("something the user has"), and an inherence factor ("something the user is").

Read more about Two-factor AuthenticationBackground, Possession Factors: "something The User Has", Cost Effectiveness, Market Acceptance, Regulatory Requirements, Product Proliferation, Interoperability of Authentication Mechanisms, Man-in-the-middle Attacks, Market Segments, Examples, Related Technologies

Other articles related to "authentication":

Self-service Password Reset - Two-factor Authentication
... Two-factor authentication is a 'strong authentication' method as it adds another layer of security to the password reset process ... In most cases this consists of Preference Based Authentication plus a second form of physical authentication (using something the user possesses -i.e ...
Two-factor Authentication - Related Technologies
... Two-factor authentication solutions sometimes includes technologies to generate one-time passwords, a few solutions also include single sign-on (SSO) technology ...
Factors and Identity - Two-factor Authentication
... representing two factors are required for identification, the term two-factor authentication is applied — e.g ... plus a PIN and a day code (knowledge factor elements), but this is still a two-factor authentication ...