[lisper]

1-4 from the original article are based on the premise that the iPhone is in fact as secure as Apple claims it is, and tries to reverse engineer how that could be done. Your point #5 is a possible way that the phone could in fact be insecure despite 1-4. My point is that unless you have your own silicon foundry you have no choice but to trust someone, or resign yourself to the possibility that your iPhone may not be secure despite what Apple says.