If I have an account, say with google, and only use that account from location A, using device A, and another google account only used with device B in location B, if I used the same 2fa FIDO key for both accounts, would google have any way of knowing the same key is being used for both accounts?
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Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking.– Community BotJul 16, 2022 at 18:25
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1Google doesn’t allow you to tell them what authenticator you will be using, they generate a secret code and a QR code, so your example isn’t possible. Most websites are the same way.– RamhoundJul 16, 2022 at 19:58
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1 Answer
A website has no way of knowing where the certificate that was used is physically located on the user's computer, meaning from which device it was read.
The answer is No.