![]() If that's all you need then anybody who knows your username and password can sign in as you from anywhere in the world!īut if you have multifactor authentication enabled, things get more interesting. Let's say you're going to sign into your work or school account, and you enter your username and password. How does multifactor authentication work? Something you are - Like a fingerprint, or facial recognition. Something you have - Like a smartphone, or a secure USB key. ![]() Something you know - Like a password, or a memorized PIN. The three most common kinds of factors are: For example, a password is one kind of factor, it's a thing you know. A factor in authentication is a way of confirming your identity when you try to sign in.
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