Dropbox has added USB Security key support for accessing Dropbox services or singing into the site. Dropbox is already providing 2 step authentication since past few years.
USB security keys, Universal 2nd factor keys can enabled by going into the settings of your Dropbox account. Company said in a statement that:
Once you have a key, go to the Security tab in your Dropbox account settings and click Add next to Security keys. Currently, U2F is only supported for using the Chrome web browser.
So are you guys ready for using these keys?