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Keys under FIDO2 or U2F can do that if the service supports it.
I recommend you Solo Keys instead of Yubikeys which are free software and free hardware.
I believe NitroKeys are open source too? i don’t think a lot of sites fully support FIDO2 tho
solo keys looks interesting! Am I right that it could be used as a password, not like a 2FA only?
upd seems it more 2FA solution
If you have an account in a Nextcloud instance and has added the application for its support (and I think that must also add a configuration but I didn’t check yet), you can use it there.
Mailcow also supports it, but I think only as 2FA and the other service I know is nonfree, so I don’t want to mention it.
Support is still the process but I think that some or most mainstream websites support it at some point.
keepassdx app for android supports the use of a keyfile. you could keep the keyfile on a usb. but if the usb drive breaks or usb port breaks… then you may have a problem.
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Maybe mooltipass does what you are looking for? It’s open source hardware too.
I haven’t looked at the software but I instantly thought of the fifth element
Haha that’s what it was named after. Makes it very easy to remember! https://hackaday.com/wp-content/uploads/2014/04/multipass__by_mixmasterangel-d5yihtc.jpg?resize=800,509
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Security, it has a physically secure design. Portability, you can take it with you and use it on any computer. It has an emulate keyboard feature. There is a Bluetooth version too I think so you can use it with your cell phone even maybe not sure.
oh… looks interesting, never heard of! Have you tried it?
I haven’t. But it looks cool. It was developed on hackaday.
Looks great for sure!
Maybe YubiKey and the alternatives to it might be useful for you.