Two-Factor Authentication
The most pervasive example of single-factor authentication is having a password to prove that you are who you say you are. Two-factor authentication involves both something you know and something you have. A password or PIN is something you know. Something you have can come in many different forms but is usually either an electronic token of some sort or a biological property, such as your fingerprint or retina, that can be used to identify you. Using two factors to prove who you are is much better than using a password alone: whereas a password can be electronically stolen, obtaining both a password and a unique physical device—or a finger, for that matter—is substantially more difficult.
One challenge with two-factor ...
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