It's not a big deal if you forget your password (you can reset it in a matter of minutes) but if you lose your USB key, it may take more time to replace it.Īuthor's note: The above drawbacks are sooner inconveniences similar to the necessity to lock your house and car doors and carry keys to those locks. If the key is using Bluetooth, the computer must also support relevant wireless connection methods. The machine or system to which you want to sign in must have a functioning USB port with the same form of the connector as the USB key. You must have the USB key with you each time you want to log in (or use a fallback password or "What you know" secret to log in). 
Some cons of using a USB key as the second factor of authentication: Ok, you will feel much safer but what about the downsides of U2F devices? Do they have any? You can compare the feeling to the one when you change your old spring latch door lock to a new deadbolt type lock. What it does for you is significantly increases security.
We don't say that a USB key is absolutely perfect security mean. Undoubtedly, 2FA is a huge leap in data protection in comparison to reusable passwords.
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