this post was submitted on 14 Oct 2026
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I would say this is already proven to be wrong, since Microsoft Windows appears to be already doing exactly that with the special hardware device "TPM": https://rossmanngroup.com/services/encrypted-data-recovery/bitlocker ...in regular customer machines.
The TPM exists because it's useful to support use cases where you want your passkeys tied to a device. It isn't a Microsoft thing either. I run Linux - my computer has a TPM. I can't use it because Linux support for the TPM is weak still, but it's there! You probably have one too if your computer was made in the last decade.
By default, even on Windows, your website passkeys aren't stored in the TPM. No one is forcing you to store your passkeys on the TPM.
And they won't, because it's a bloody stupid idea that benefits no one.
Microsoft wants your passkeys synced across devices because that's how you get lock in. If the passkeys are stuck on the computer you made them on, then you may as well buy a Mac for your next computer because those passkeys are gone either way! If the passkeys are in Microsoft Password Manager though, now migrating to a Mac is harder.
Oh I know I have a TPM, yes. I blacklist all the Linux TPM modules though. Screw that thing.