1. First off, from a technical PoV this proposal (like most others) implies the existence of some ‘master key to all iPhones’. When that key gets stolen, there’s really no mechanism to detect it.pic.twitter.com/SIM7y5gdRF
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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1. First off, from a technical PoV this proposal (like most others) implies the existence of some ‘master key to all iPhones’. When that key gets stolen, there’s really no mechanism to detect it.pic.twitter.com/SIM7y5gdRF
2. More critically, Ozzie’s proposal relies on ‘a special chip inside the phone’ that bricks the phone if someone abuses the access mechanism. This is cute. It’s also (at present) a big fat giant elephant in the room.pic.twitter.com/swtkNTmSxg
3. Let’s be more clear about this. All Apple phones have a similar chip inside of them. This chip is designed to prevent people from brute-forcing the passcode by limiting the number of attempts you can make. At present, every one of these chips appears to be completely broken.
4. Specifically, there is some (as yet unknown) exploit that can completely bypass the internal protections provided by Apple’s Secure Enclave Processor. So effectively “the chip” Ozzie relies on is now broken.http://www.dailymail.co.uk/sciencetech/article-5613597/Police-claim-unlock-iPhone-using-mysterious-10-000-GrayKey-box.html …
5. When you’re proposing a system that will affect the security of a billion Apple devices, and your proposal says “assume a lock nobody can break”, you’d better have some plan for building such a lock.
6. From my perspective, this problem alone is sufficient to make the Ozzie proposal unworkable.
7. ”Hold on,” I hear you cry, “so what if a few government agencies and hackers have a fancy 0day. That doesn’t mean anyone else will get it!” Have I got a headline for you. https://motherboard.vice.com/amp/en_us/article/qvx9jx/iphone-crackers-grayshift-graykey-leaked-code-extortion …pic.twitter.com/cPxW0Fv6c1
8. So let’s recap. We are going to insert a backdoor into billions of devices. It’s security relies on a chip that is now broken. AND the people who broke that chip MAY HAVE LEAKED THEIR CODE TO EXTORTIONISTS ON THE INTERNET.
9. The extortionists are apparently demanding 2 bitcoins.pic.twitter.com/gOKDhdWzHc
10. While this is not personal to Ozzie and I don’t hold him responsible for this, this episode exhibits all the characteristics of ‘crypto backdoor’ proposals since time began.
I do. And Wired. People like this need to be no-platformed. It's shameful that Wired, etc. give them opportunities to peddle bullshit that puts everyone in danger.
Especially in this case where he's peddling something he filed for a patent on.
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