The ultimate comeback:
Trump: "Cook, who do you think you are?"
Cook: "Trump, unlike you, I am a Christian."
"Someone who wants to build walls instead of bridges is not a Christian" (Pope Francis).
And Trump's behaviour after being told off like a little child clearly proves that he doesn't understand that whole Christian thing.
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I took a course in mobile security and the instructor showed us how easy it is to break into the 4 digit password on an iPhone (which is what the terrorists used). It takes about 30 seconds. The method is to virtualize the contents of the iPhone first then run the cracking program which runs all possibilities of the 4 digit password. That's even with the 10 attempt limit turned on. I would guess that the FBI knows this so I'm wondering if anyone knows what Apple did to improve the security to prevent the iPhone from being moved into a virtualize environment. I haven't tried it myself but it seems like it would be pretty easy.
In that case, your instructor is a complete idiot.
To unlock an iPhone, you need three components: There is an encrypted master key, with copies stored in two locations of the flash drive (that's why an iPhone can be completely erased in a millisecond by overwriting just these two locations on the flash drive). The second component is obviously the passcode that you type in. The third component is an encryption key built into the CPU. That key cannot be read. It can only be used for encryption and decryption. Apple doesn't know that key. It cannot be reproduced.
Once you clone the drive, remove it from the iPhone, you can't get the master key anymore, because one of the three needed components is gone. The only thing you can do is trying to break per file SHA-256 encryption. Which is impossible to break in the first place, and if you break it, you've got ONE file from the device.
All that information and much more is available on Apple's web site at
https://www.apple.com/business/docs/iOS_Security_Guide.pdf . For your instructor not reading this or not understanding it is unforgivable.