When Apple launched Find my Mac as an extension to their Find my iPhone system back in October of 2011 they included the ability to lock a Mac down so that it couldn't be accessed or rebooted into alternate modes. The lock, however, was implemented using a simple 4-digit passcode (PIN). That meant, with only 10,000 possible combinations, the passcode was susceptible to brute force attack. That's nothing new. It's been known since the start. What's new is that automated tools have now been developed to make the attack both easier and faster, and they're being reported on without a lot of context. So, is it something you should worry about?