How do passkeys work across devices?

RGB3x3@lemmy.world to No Stupid Questions@lemmy.world – 58 points –

Let's start with a smartphone. A user creates an account with a passkey for a service, that passkey gets stored on their smartphone, and they can use biometrics to sign in from then on. The private key is stored on the smartphone. Great.

But then how do you sign into that same service from a different device?

If it's by using a password manager, some third party piece of software, How do you sign in on a device where you're not allowed to install third party software?

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This doesn't exist

FYI there's a bug currently that lets everyone see the comment even after they are deleted

I use sync on android but I believe it's a bug in the API so it should be everywhere

Just try to reply to the comment and you'll see it