What are the hardware requirements for implementing the FIDO U2F standard? Are there any issues with backwards compatibility?

1142875 pts.
Tags:
Authentication
FIDO
I'm thinking about revamping my personal OP-SEC in the near future but I need to make sure that the security token I get will be backwards compatible with the FIDO standard. Would anyone happen to know of what's required of hardware to implement FIDO U2F standard and if xNT is future-proof? Why can't I just encrypt the public/private keys for U2F instead?
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The standards were set by Google, and there are no need for drivers,
middleware, or client software. You can use native drivers. There is no
installation required.

Yubico contributed to the specification and makes hardware that is FIDO compatible. Yubico has a page that links to probably all of the information you will need in order to implement and use FIDO U2F. Here’s the page: https://www.yubico.com/applications/fido/

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