A YubiKey 4, YubiKey Nano, FIDO U2F Security Key, YubiKey NEO, or YubiKey NEO-n.

Latest version of Google Chrome browser (or at least version 38).

Here are the requirements to secure your Dropbox account with the Yubico key: This is also where you will set up your mobile device as a backup in cases where you can't use the key.

Set up Two-Step Verification for your Dropbox account, if you haven't already. U2F security keys can be used as an additional method of two-step verification for Google accounts, Dropbox, GitHub, GitLab, Bitbucket, Dashlane, Lastpass and the UK's Government Digital Service. U2F security keys are supported by Google Chrome since version 38 and Opera since version 40.

U2F was created by Google and Yubico, with contribution from NXP, and is today hosted by the open-authentication industry consortium FIDO Alliance. Here's a little more about the FIDO U2F standard: Then I had to log out, log in on a different page and then touch the button/touchpad on the security key to complete authentication. I entered password/username and clicked next.

Next I plugged the key into my PC, it blinked a few times. The key I bought is the one on the far right. The key came in a tiny envelope that at first I didn't even see in the Amazon box (it can't be more than 2 x 2 inches.) The key is ready as soon as you unbox it, but if you want to test it out you can use Yubico's website. The FIDO U2F Key is less than $20 on Amazon. But there is another way, and it's a tiny FIDO U2F security key that I've now put on my keychain. Just yesterday I had to go into Google Authenticator for a code and when I logged into my GitHub account from my husband's laptop, I needed to enter the code I got by text. If you haven't read the article, I recommend you do, after which you'll likely get used to the idea of having 2FA on some of your accounts.

Last week we discussed the basics of two-factor authentication (2FA) and why it's a good idea to take advantage of it.

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