While not 100% open source, I'm a big fan of YubiKey--if you're going to do 2FA, then there is no better solution IMHO.

https://www.yubico.com/

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Great product but for the person that will using it they just need to be able to keep track of master keys inside the app without backing anything up to the cloud. I doubt they'll spend even $5 for this use case.

Hiya

Quite a bargain to maintain man over machine by design, along with having something where ‘communism’ makes them proud creating value rather than needing it.

Get that risk out of the way and own it.

🤔