Create a password that you don't use anywhere else, and make it hard to guess. Test your password with our strength estimator when you create your account or reset your password
This security feature adds an extra layer of protection to your account. Once enabled, Dropbox will require a six-digit code or a USB security key when signing in or linking a new device. For security keys, Dropbox supports the open standard FIDO Universal 2nd Factor (U2F). A U2F security key uses cryptographic communication and provides additional protection against credential theft attacks like phishing
From the Dropbox Security page, you can easily monitor linked devices, active web sessions, and third-party apps with access to your account. Something doesn't look right? You can cut off access in seconds. From the Events page, you can track changes to files and folders, including edits, deletions, and shared folder membership.
Attackers may try to steal sensitive information by pretending to be Dropbox or other services you trust. Be on the lookout for unfamiliar emails, websites, and links that try to trick you into entering your password or other sensitive information. Additionally, if you see anything suspicious being hosted on Dropbox, report it to Dropbox.
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Source: Dropbox