Two-factor authentication, or multi-factor authentication, is not a topic only for nerds anymore. Many services on the internet provide it, and many end-users demand it. While the average end-user might only realize that his preferred web site either offers MFA or it does not, there is more to it behind the scene.
The two-factor market is changing, and changing rapidly. New authentication methods arise, classical vendors are merging, and products have disappeared.
