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Most importantly, security keys use authenticated communication to defend against phishing attacks. Unlike SMS or mobile app verification, a security key doesn’t require a separate battery or network connection. 'Web Authentication (WebAuthn)', also known as 'FIDO2’.A security key is a small USB, Bluetooth, or Near Field Communication (NFC) device that follows one of the open standards: You can use a security key for multi-factor authentication, rather than a six-digit security code. How to use a security key for multi-factor authentication Enter one of your emergency backup codes.Under Two-step verification, click Show next to Recovery codes.Each eight-digit code can be used once to access your Dropbox account in case of emergency. When enabling multi-factor authentication, you'll receive 10 backup codes. How to use a backup code for multi-factor authentication Enter the phone number of your backup device.Under Two-step verification, click Add next to Backup method.Click your avatar (profile picture or initials) in the upper-right corner.If you ever lose your primary phone, or can't use your authenticator app, you can send a security code to your backup phone number instead. How to add a backup method for multi-factor authenticationĪfter enabling multi-factor authentication, consider adding a backup phone that can receive text messages as well. You'll be prompted to enter your password to continue.Click the avatar (profile picture or initials) in the upper-right corner.How to change your multi-factor authentication phone number Once the authenticator app is configured, enter the security code it generates to verify setup and enable multi-factor authentication.Use the steps in your app to add a new account using a secret key. Manually enter your secret key: You'll be given a secret key on that you can type into the app. You may then be able to use your phone's camera to scan the barcode on. Scan the barcode (If your app supports it): Open your app of choice and choose to add a new account.Select Use a mobile app during multi-factor authentication setup.If you use an authenticator app to receive your verification codes, please add primary and secondary backup phone numbers. Any app that supports the Time-based One-Time Password (TOTP) protocol should work, including: Most authenticator apps can generate security codes even when cellular/data service isn't available, which can be useful when traveling or where coverage is unreliable. The authenticator app you choose will need to generate a unique time-sensitive security code. If you choose to receive your security codes through an authenticator app, you’ll first need to download one.
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