Dropbox now lets you secure your files with a physical USB key

In an effort to adopt a greater variety of strong authentication protocols into its system, Dropbox today announced via blog post that the company will now support Universal 2nd Factor (U2F) security keys as a valid 2-factor authentication method. U2F security keys are physical objects that you place in a USB drive, which follows a open standard from the FIDO Alliance. In order to log in with this method, users must place their key into the USB when logging in to a site. If you want to access Dropbox with your key, the company says it is only currently supported…
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