But that's just the start of what this remarkably powerful, and remarkably tiny, device can do. The fifth generation of the YubiKey supports FIDO U2F for a secure second-factor authentication and uses NFC to work with your phone. Thankfully, the Yubico YubiKey 5 NFC is here to protect our most important accounts and much more besides. Passwords have been the weak point of security since they were first introduced.
How to Set Up Two-Factor Authentication. How to Record the Screen on Your Windows PC or Mac. How to Convert YouTube Videos to MP3 Files. 
How to Save Money on Your Cell Phone Bill. How to Free Up Space on Your iPhone or iPad. How to Block Robotexts and Spam Messages. So if the yubico breaks, I can use the cheapo backup until I receive the replacement yubico key. I got this and a cheapo but we'll functioning basic key for ten bucks. Next.note you should have 2 keys for backup, but they don't have to be the same, not do you need two of these 5 series yubico. So the key I got was on a firmware from about a year ago and is missing a few profiles added to some security protocols I don't use. But they can't be updated in the field due to security issues. This key, like others you'll find for sale away from the manufacturer may have older key firmware with a bug or improperly implemented feature. Yubico, a company that drives the above standards extends those to additional protocols, a yubico authenticator app that works in conjunction with the key. Fido, fido2 and u2f are pretty well covered. Other than standard two factor logins with a key. I won't explain what it does, I presume folks know it's for higher login/data access above and beyond passwords. 
Good key, buy them on eBay to save $ but be advised.
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