Η dropbox announced today that it's bringing a new security feature to all of them users her. The new feature will make the end-user experience in the Cloud storage service much more secure, as Dropbox has released a new way to connect to wrenches Universal 2nd Factor security as a complementary method for two-step verification. 
This means that users of the service will be able to use USB keys as a two-factor connection verification in the Dropbox.
Security keys are a much easier way to connect to dropbox.com. After entering your password, you put the key to the USB port when prompted.
The method, albeit similar to the one it uses, is much easier to use, since you do not have to worry about the battery being run on your device.
To set up this two-factor connection method you will need a dedicated USB that is compatible with the FIDO open standard Alliance and is called FIDO Universal 2nd Factor.
Settings are available today in your Dröpbox account, along with similar U2F-enabled services.
