"We have a feature called iCloud Keychain Backup, and here's what we do. We have a new credential, the iCloud Security Code, and most often this is the device p

"We have a feature called iCloud Keychain Backup, and here's what we do. We have a new credential, the iCloud Security Code, and most often this is the device passcode." - Apple security architect, in the aforelinked video, which you still didn't watch