A hardware authenticator like a Yubico YubiKey is something you have. Something you are could include biometrics, like a fingerprint scan. Most of us use password authentication in our day-to-day lives, which is something you know.
The term " multifactor authentication" comes from the idea that there are three ways to prove who you are by presenting at least one of the following: Something you know, something you have, or something you are. At $55 it's not the cheapest option, but its sheer versatility makes it a new Editors' Choice winner. The 5C NFC also has a variety of authentication capabilities and will work with just about any recent device you own. Hardware multifactor keys like the Yubico YubiKey 5C NFC provide all the security of competing systems, but they do so without moving parts, batteries, or an internet connection.
Note: You can also approve or deny your login requests from within the app by tapping Security, then tapping Login Requests. You can opt into this by clicking request a code sent to your phone via text message when you log in to your account on. You may also receive a login code via SMS text message.
Once you approve, you will be immediately logged in to your account on. Open the push notification to approve the login request. When you log in to your account on or on another device using Twitter for iOS, Twitter for Android, or, a push notification may be sent to your phone. If you enrolled in login verification before March 21, 2016: Security keys can be used as your sole authentication method, without any other methods turned on. Note: If you add a security key for additional two-factor authentication protection, we no longer require using another backup method for more protection.
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