[ninalanyon]

So now I have to have a mobile phone?

[sonic45132]

I feel the idea of public key encryption could be done without a phone but the device locking makes it harder to transfer the token off device. Like the parent comment said, I think 90% is all we can aim for. Nothing is going to be perfect.

[maccard]

Secure Enclave on a mobile phone, or an NFC smart card both work fine. It could be your passport, drivers license, national ID, whatever.

[rustyminnow]

Could probably be implemented by a smartcard or yubikey-like device as well. Shoot, just build it into my state issued ID card.

[intrasight]

Identity wallets can be made to work anywhere.

[pluralmonad]

And one you don't fully own/control. Fully owned devices will be unsupported, obviously.

[petemill]

Sounds like what a government issued card should be used for, which seems fine

[izacus]

You can have an ID card. Just like for buying alcohol and cigarettes.