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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 22 Feb 2016
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      Apple is outright lying here. "the technique could be used on any number of devices" - not since the iPhone 3GS! https://www.apple.com/customer-letter/answers/ …

      2 replies 7 retweets 6 likes
    2. Hector Martin‏ @marcan42 22 Feb 2016
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      Replying to @marcan42

      Apple introduced per-device firmware signing (SHSH blobs) in the iPhone 3GS to stop people from downgrading (as a jailbreaking deterrent).

      5 replies 6 retweets 5 likes
    3. Christopher F. Nicholson‏ @chrisFnicholson 22 Feb 2016
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      Replying to @marcan42

      @marcan42 can you extract SHSH blobs from a backup? It's certainly been possible to jailbreak devices after the 3GS.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 22 Feb 2016
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      Replying to @chrisFnicholson

      @chrisFnicholson You can't downgrade an iPhone to an older, jailbreak-vulnerable version (unless you have the matching SHSH blob).

      2 replies 0 retweets 1 like
    5. Christopher F. Nicholson‏ @chrisFnicholson 22 Feb 2016
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      Replying to @marcan42

      @marcan42 right, so my question is: can you get those blobs off of an iCloud backup, or do you need the unlocked device?

      1 reply 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 22 Feb 2016
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      Replying to @chrisFnicholson

      @chrisFnicholson You need a jailbroken device to extract the blobs as far as I know. Definitely not in the backup.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 22 Feb 2016
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      @chrisFnicholson Alternatively you can request them from Apple's server *at the time that version was actually current*, but not post-facto.

      11:12 AM - 22 Feb 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Christopher F. Nicholson‏ @chrisFnicholson 22 Feb 2016
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          Replying to @marcan42

          @marcan42 would apple's cracked version look the same? Put another way, can FBI request the blobs?

          1 reply 0 retweets 0 likes
        2. Hector Martin‏ @marcan42 22 Feb 2016
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          Replying to @chrisFnicholson

          @chrisFnicholson Obviously they wouldn't be freely handing out signatures for the special firmware via their usual servers.

          1 reply 0 retweets 0 likes
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