On June 13, following its opening conference of the WWDC 2016, Apple released the first beta version of iOS 10 (read: Download and install iOS 10 beta without a developer account). It turned out that the firmware kernel was not encrypted, so that security researchers (and also hackers) could find flaws (and why not exploit them to offer a jailbreak!).
While everyone wondered if this was voluntary on the part of the Cupertino company, the latter confirmed with TechCrunch that this unprecedented choice not to encrypt the kernel of iOS 10 is deliberate. “The kernel cache does not contain information about the user, and not encrypting it, we are able to optimize the performance of the operating system without compromising securitySaid an Apple spokesperson to the US site.
The second beta of iOS 10 should arrive in the coming days, probably with many bugfixes and improvements reported by the first testers. It is very likely that Apple encrypts the kernel in the second pre-release if it judges the feedback from the researchers conclusive. The final version of the operating system, meanwhile, should be released next September, with the iPhone 7 and iPhone 7 Plus.