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Passwords are synced to Windows via iCloud, i suppose these keys would be synced like that as well: https://support.apple.com/en-gb/guide/icloud-windows/icwd3c1

• mort96 4y ago
  Right, but all software which uses passwords would need to support it too, right? I'm not confident that all of the Windows ecosystem will adopt iCloud for passkeys, nor am I confident that Apple will tightly integrate into whatever system thing Microsoft puts in Windows to manage FIDO keys... This isn't like a password manager after all, where getting the key in your clipboard is a universal way to use it anywhere you want.
  • WorldMaker 4y ago
    Apple says they are working with Microsoft and Google to meet all FIDO standards on this. It's still early days, but FIDO as a standards body does seem to be working towards standards for working with heterogenous keychains. Given how many users use Chrome on Windows and have an iOS device, I think heterogenous keychains are going to be critical to mass adoption and everyone says they are working towards that. A lot of this may be on FIDO to truly coordinate.