Let's talk about why these devices are hard to get into.
There is going to be hardware-level encryption.
So we have AES 256-bit hardware-level encryption.
This is what prevents brute force attempts, when
we think about this.
What I'm talking about on the slide
has nothing to do with the user locking their device.
That's an additional hurdle.
So by default, hardware-level encryption is there.
In addition to that, every single user-created key
gets a file key.
Now, this is why, when the user deletes that file,
it goes to encrypted unallocated space.
The file key is gone.
There is no knowledge of it.
There is something called the master key that
tracks all of those file keys and the files
that they belong with.
When you wipe an iOS device, the only thing
that's truly overwritten is the master key.
Think about this.
If you have a 1-terabyte iPhone and you have a 50-gig iPad,
they're going to wipe in the same amount of time
because it's only wiping the master key.
I hear people ask all the time, is it
safe to turn in my iPhone?
Can I give my iPhone back?
I want to upgrade it.
You are overwriting the master key
when you follow those steps.
All of your data is now encrypted unallocated.
Nothing is going to put it back together.