I heard the argument before that relay attacks can’t be solved because it is too hard to measure distance/time of flight. Except that the NASA Apollo missions were able to do so, on a 2ghz signal with 1.5 meter accuracy all the way to the moon. It used complex equipment back then, but not by today’s standards. It’s not impossible, it is just too expensive.
It also notifies the user with a haptic and audio notification when the Watch has been used to unlock a Mac.
In an open plan office it works around 2 meters away at maximum.
There seems to be some kind of heuristic when it allows it too, the first login for the day requires a password or TouchID to be used, but the ones after that work via the Watch.
https://www.righto.com/2022/04/the-digital-ranging-system-th...