If there is anything the tech world has learned about security, its that four-digit PINs are fundamentally unsafe. Align that against a poorly managed security foundation, and what you have is an open invitation for brute-force attacks. Unfortunately, this is what Apple has done with their iCloud implementation. If an Apple computer is remotely locked by an iOS device, the user would need to enter a 4-digit PIN on the Find My Mac app in order to unlock the machine.
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