Brian Barrett, writing for Wired:

The iPhone makes for an ideal health care aide, thanks to its motion-tracking M-series coprocessor suite of sensors, and its huge install base. There’s no limit to what people with serious medical conditions can track, and no cap on how useful an iOS device might be in coping with the day-to-day realities of illness. Our phones, if they didn’t already, will know more about us than we know about ourselves.

It’s the sort of information you can’t provide unless you know that it will be protected, and the kind of data you can’t collect unless you know you can protect it. The sort of information that simply can’t be given or received without strong encryption.

Exactly.