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I'd really like to buy a U2F token, but need to find one that let's me use it mobile (Android) as well as on desktop.

I know that Yubico offers an NFC-enabled on, but it doesn't support 4096-bit keys if I understand correctly.

The Fidesmo dual-interface smartcard might fit the bill: http://shop.fidesmo.com/product/fidesmo-card-dual-interface You would need to buy and install the U2F applet ("card app") onto it. There are other applets available for PGP and for Bitcoin wallets, which can co-exist on the same card AFAIR. Not sure about supported key lengths. I'm not affiliated with Fidesmo or the applet vendors.

Any opinions on this product from the HN crowd? E.g., what do you think about the security implications of their user-installable applet model?

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