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I have a potential application for a U2F keys and I'm wondering why you recommend the $18 Yubikey on Amazon versus the $10 one that is also FIDO certified. Is there a difference in the function or some other important difference?

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Not the OP but, I use a $6 one without a button that simply activates on insert. Unfortunately the company that sold them is more interested in bulk sales and the stopped selling individual units. I plan to eventually replace it with the Feitian ePass NFC FIDO U2F Security Key, which is still $17 but includes NFC which I could use with my android phone. for that functionality from Yubi you would need the $50 Yubikey Neo.

Tbf, yubikey neo has much more features than feitian epass.

I have a cheap HyperFIDO from a company in British Columbia. https://www.hypersecu.com/products/hyperfido/

Works the same as my $18 Yubi key but the little cover over the USB prongs keeps falling off...

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