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Re:Apple leaves iOS 10 kernel unencrypted in developer preview by rmateu on Wednesday June 22, 2016 @01:17PM (#11955482)
Probably the best informed reason:

>Streamlining the operating system.

>Since it contains only the kernel, device drivers, and configuration files — and absolutely no user data — the iOS 10 kernel cache can be left unencrypted without any concerns over security or privacy.

[Here's why the iOS 10 kernel cache is unencrypted | iMore](http://www.imore.com/heres-why-ios-10-kernel-cache-unencrypt...)

Re:Apple leaves iOS 10 kernel unencrypted in developer preview by mikeash on Wednesday June 22, 2016 @01:40PM (#11955636)
That would seem to imply that previous iOS versions put user data in the kernel cache. Why would that be?
Re:Apple leaves iOS 10 kernel unencrypted in developer preview by oddevan on Wednesday June 22, 2016 @01:58PM (#11955738)
Alternatively, they just decided to encrypt everything, maybe in case there was some sort of user data in the kernel cache. Now that they have a better idea of things, they can be selective.