On Dormant Cyber Pathogens and Unicorns 

When trying to get at the technical core of what the FBI is asking of Apple, this researcher/hacker/forensic scientist/? seems to have the explanations.

Might I suggest you start here and here and a Summary

Really you should just go read the last 15 or so posts.

This is a controversial topic, but at the core of the debate is a tremendous amount of misinformation and purposeful ambiguity. Fight the FUD (fear, uncertainty and doubt).

Source: Zdziarski’s Blog of Things