Apple Confirms Unencrypted Kernel in iOS 10 Beta is Intentional

Yesterday it was discovered that iOS 10 does not feature an encrypted kernel, allowing users and researchers access to the core of the operating system and its inner workings. It was unclear at the time whether the lack of encryption was an accident or intentional, but today Apple confirmed to TechCrunch that the company did not encrypt the kernel for a reason.

ios10

“The kernel cache doesn’t contain any user info, and by unencrypting it we’re able to optimize the operating system’s performance without compromising security,” an Apple spokesperson told TechCrunch.

The kernel, which dictates how software can use hardware and keeps the device secure, is unencrypted so that developers and researchers can "poke around" and find potential security flaws. Because the kernel is easier to access and flaws may be easier to find, Apple can more easily and more quickly patch potential issues.

The move is a shift for Apple, who had encrypted the kernel in past versions of iOS, leaving developers and researchers out of the loop on the inner workings of the operating system. As noted by security expert Jonathan Zdziarski, it's likely that Apple has made this shift to prevent groups from "hoarding" vulnerabilities in Apple's software, like the vulnerability used by the FBI to break into the iPhone 5c of the San Bernardino shooter.

Related Forum: iOS 10

Popular Stories

iPhone 17 Pro 34ths Perspective

iPhone 17 Pro Launching Later This Year With These 10 New Features

Sunday March 23, 2025 10:00 am PDT by
While the iPhone 17 Pro and iPhone 17 Pro Max are not expected to launch until September, there are already plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models as of March 2025: Aluminum frame: iPhone 17 Pro models are rumored to have an aluminum frame, whereas the iPhone 15 Pro and iPhone 16 Pro models have a titanium frame, and the iPhone ...
macbook pro blue green

When Will Apple Release the M5 MacBook Pro?

Wednesday March 26, 2025 4:53 pm PDT by
Apple regularly refreshes the MacBook Pro models, and a new version that uses M5 series chips is in the works. Apple just finished refreshing most of the Mac lineup with M4 chips, and now it's time for the M5. Rumors suggest that we could see the first M5 MacBook Pro models this fall. Design There have been no rumors of a design update for the M5 MacBook Pro models that are coming this...
Apple Lumon Terminal Pro

Apple's Mac Site Features Fictional 'Lumon Terminal Pro'

Wednesday March 26, 2025 12:19 pm PDT by
Apple is going all out with promotions for the popular Severance Apple TV+ show today, and as of right now, you'll find a new "Lumon Terminal Pro" listed on Apple's Mac site. The Lumon Terminal Pro is designed to look similar to the machines that Severance employees like Mark S. and Helly R. use for macrodata refinement. The Terminal features a blue keyboard, a small display with wide...
Facebook Feature

Facebook's New iPhone App Feature Turns the Clock Back to 2007

Thursday March 27, 2025 1:59 pm PDT by
In the mid-to-late 2000s, Facebook was all about staying connected with friends and family. However, as the social media platform added new features and grew over time, that core experience began to get drowned out. That changes starting now, according to Meta, which today introduced a new feature that will "bring back the joy" of classic Facebook. Specifically, Meta has redesigned the...
Generic iOS 18

iOS 18.4 Coming Soon With These New Features for Your iPhone

Tuesday March 25, 2025 6:45 am PDT by
Apple is expected to release iOS 18.4 to the general public as soon as next week, following more than a month of beta testing. Apple's website says some iOS 18.4 features will be released in "early April," so the update should be out as early as Tuesday, April 1. Apple this week seeded the iOS 18.4 Release Candidate, which is typically the final beta version, barring the discovery of any...
iPhone 17 Pro 34ths Perspective

iPhone 17 Pro Supports 8K Video Recording, Suggests Leaker [Updated]

Wednesday March 26, 2025 4:06 am PDT by
Update 7:25 pm: Based on comments from our forums, it appears the original Weibo post may have been mistranslated and "8K" actually refers to the high price of the device rather than 8K video recording capabilities. The iPhone 16 Pro currently starts at 7,999 yuan in China. Our original article follows below. Apple's forthcoming iPhone 17 Pro models are capable of shooting 8K video, up...
Foldable iPhone 2023 Feature 1

'iPhone Fold' to Feature Metallic Glass Hinge That Resists Deformation

Thursday March 27, 2025 4:21 am PDT by
Last week, we covered a report claiming that Apple's book-style foldable iPhone (or "iPhone Fold," as we are provisionally calling it here) will use liquid metal hinges to improve durability and help minimize screen creasing. Today, a Chinese leaker provided more details on the properties of this hinge material that help to clarify why Apple chose it for its first foldable device. According...
iOS 18 4 Ambient Music Control Center

How to Use iOS 18.4's New Ambient Music Feature in Control Center

Thursday March 27, 2025 7:45 am PDT by
The upcoming iOS 18.4 update for the iPhone adds an Ambient Music feature to Control Center. Below, we take a closer look at how it works. iOS 18.4 is currently in beta, so the Ambient Music feature is not widely available yet. The update will likely be released to the general public next week. To use the feature on iOS 18.4, open Control Center and tap on the plus sign in the top-left...
Generic iOS 19 Feature Mock

Gurman: Jon Prosser's iOS 19 Mockups 'Aren't Representative' of Redesign

Tuesday March 25, 2025 4:47 pm PDT by
The iOS 19 mockup images that leaker Jon Prosser shared today are not representative of the actual iOS 19 design, Bloomberg's Mark Gurman said on social media. According to Gurman, the images that are "floating around" are based on "very old builds" or "vague descriptions," and are lacking key features. Gurman says that we can "expect more from Apple in June." Gurman made the same comment ...

Top Rated Comments

Quu Avatar
114 months ago
I'd just like to point something out. Apple does not offer a bug bounty program. That is to say there is no bounty to be awarded if you report a bug to them no matter how serious it is.

By contrast Microsoft offers $100,000 for a unique kernel level exploit, $15,000 for a Edge browser exploit and $100,000 for a unique solution to a presented exploit that they have yet to come up with / implement.

So if you were to find an Edge browser exploit in Windows 10 and another exploit that allowed you to jump the sandbox and gain root access to the operating system and then figured out a solution to stop the attack that is safe and implementable you could earn yourself $215,000.

Find the same in iOS, macOS, watchOS or tvOS and earn $0. It's about time Apple got serious and offered their own bug bounty program. It's the most meaningful way to get serious vulnerabilities reported.

And remember the FBI and NSA are paying upwards of $1 Million dollars (as shown in congress reports) for root level attacks on iOS, macOS and Windows. That is the competition. If you're a security researcher who're you gonna tell? Apple and earn nothing or the NSA/FBI and change your entire life?
Score: 57 Votes (Like | Disagree)
6836838 Avatar
114 months ago
I see. So open-source now equals openly exposing vulnerabilities for the collective good so a select user group can not exponentially exploit said vulnerability.

Yeah, didn't work too well for Android, though.
You're very confused. Please research the difference between binaries and source code.
Score: 27 Votes (Like | Disagree)
RichTeer Avatar
114 months ago
I see. So open-source now equals openly exposing vulnerabilities for the collective good so a select user group can not exponentially exploit said vulnerability.
Umm, unencrypted binary != open source...
Score: 26 Votes (Like | Disagree)
C DM Avatar
114 months ago
I see. So open-source now equals openly exposing vulnerabilities for the collective good so a select user group can not exponentially exploit said vulnerability.

Yeah, didn't work too well for Android, though.
Where does open-source come from? :confused:
Score: 21 Votes (Like | Disagree)
doelcm82 Avatar
114 months ago
In Apple marketing terms, this is called innovation.
Apple marketing is not calling this anything.

You are calling it innovation, and then snickering at the "Apple marketing" in your mind for calling it innovation.

Well done.
Score: 9 Votes (Like | Disagree)
Nothlit Avatar
114 months ago
So has anyone in the tech press asked them why only the 64-bit kernelcache was left unencrypted while the 32-bit kernelcache remains encrypted? What about the update and restore ramdisks, which also remain encrypted? The rest of the boot chain? Why not let us peek at those, too?

Apple PR's statement that "[t]he kernel cache doesn't contain any user info" is ridiculously obvious to anyone with technical knowledge in this area. That statement is clearly only intended to placate the non-technical masses who might hear "Apple" and "unencrypted" in the same sentence and get worried about the privacy battle.

Secondly, what sort of performance improvement can this possibly make? Even assuming the kernelcache has to be decrypted once per boot, that must take what, a couple hundred milliseconds for the hardware-accelerated AES engine to do its thing?

I am really baffled by Apple's response. If it was indeed intentional, it must have been for reasons other than what they are saying.
Score: 8 Votes (Like | Disagree)