Passkey is some sort of specific unique key to a device allowing to use a pin on a device instead of the password. But which won’t work on another device.
Now I don’t know if that key can be stolen or not, or if it’s really more secure or not, as people have really unsecure pins.
It can be cracked in less than a second?
If someone never loses their phones, laptop… Maybe it’s secure.
But if someone steals it, how secure can it be? Is the key protected by the pin encryption? If so the encryption is now useless.
Here is a French video about Micode interviewing the French DGSE : https://youtu.be/g_jEz6aF2b4?si=-sUAIvDf4F7-7kGc
They crack the phone security in 4 seconds with the pin beeing : Mic0rp2022. The software used is hashcat, an open source tool.