Recently I witnessed how iTunes, which is linked to a certain iPhone may unlock it's first screen - the one which requires a password.
I also know of a few tools which may mimic this effect;
I`m curious about how this mechanism works. Does apple hold some sort of a "master key" that can be transferred via a USB device? Is that a part of the operating system, iTunes or some of those other tools? Is that a known weakness, or a feature? How do those tools (generally) work?
Now, this question is for academic purposes only. Please do not take it anywhere else, that's not what it's meant for.