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Is there any way to use this system without an extra device (no phone, no key, only my pc)?

If not, is there a FOSS implementation of these required new devices? Maybe an emulator for one?

Can I download an manage my own keys, manually?

Can I self-host the authentication layers so I don’t need to use a 3rd party?

> Is there any way to use this system without an extra device (no phone, no key, only my pc)?

I've used rust-u2f in the past, although it seems to be Linux only. https://github.com/danstiner/rust-u2f

Thanks, I’ll check it out!

Looks like it answers some of my concerns. Super cool!