IOS5 SHSH Blobs on Cydia

Discussion in 'iPad Hacking' started by tron, Oct 30, 2011.

  1. tron

    tron
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    Hi guys

    For what it's worth, I have saved my Ios5 SHSH blobs using iSH****.

    Just noted that the iOS 5 SHSH do not appear on the Cydia home screen like the previous firmwares up to 4.3.5

    Any reason for this omission?

    Ps I have noted this on Cydia on my 3GS iPhone , iPod touch 4G and iPad 2.

    Sent from my iPad using iPF
     
  2. graywolf

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    iOS 5 no longer uses a SHSH system to do upgrades. So every time a new software version comes out, if you upgrade, you are stuck.
    Unless the dev team can crack the new system and figure it out.

    But I think you can have blobs for the initial iOS 5 software, just not the next versions. I think.
    F4780y will come correct me in just a bit.
     
  3. f4780y

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    Almost graywolf ;)

    SHSH Blobs are still being used in IOS5, it's just that Apple have improved their security by including a "nonce" component (Cryptographic nonce - Wikipedia, the free encyclopedia) which is the same mechanism they have been using for baseband signing for a while. It's the reason you can't downgrade the baseband on the iPhone or 3G iPads. In theory, this means you will never be able to downgrade to a previous version of 5.x once updates start to appear. Once you upgrade you can never downgrade (assuming the singing window for the previous version has been closed). This will make jailbreaking 5.x devices VERY INTERESTING, particularly the iPhone4S and iPad2. If you mess up your jailbreak with a bad app (or whatever), you will likely lose your jailbreak for a while because you will be forced to restore to the latest version (which should have all known jailbreak holes patched), and have to wait until the a new userland exploit is found to allow it to be jailbroken. We have enjoyed years of being in control of our jailbroken devices, but this next phase will require diligence and patience on our part. If you aren't careful about what you are installing (or deleting with iFile!) you could be out in the cold for a very long time, like anyone who recently messed up their iPad2 3G 4.3.3. jailbreak will understand...

    So to get back on topic, whilst you can save your blobs for IOS5, the nonce component renders them useless for replaying at a later date. So, there really is no point in saving them any more. It's not clear whether Saurik has stopped saving them on Cydia now, or whether he will carry on, but personally I just don't see the point. The security is unlikely ever to be cracked as it uses sufficiently strong encryption, so we would need to find another way.

    Your 4.x and 3.x saved blobs can still be kept as they will continue to work, but of course the older and older they get, the less likely it is that you will want the ability to restore the old firmwares they relate to.
     
  4. SweetPoison

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    You are so smart and knowledgeable, Leigh. Do you study this stuff in your sleep?
     
  5. f4780y

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    Yes, I dream of jailbreaking :)
     
  6. tron

    tron
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    Well, Leigh, as long as those dreams become reality...go ahead and dream on !

    Sent from my iPad using iPF
     
  7. graywolf

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    So, beyond all the gawking at Leigh, :)
    In theory, to downgrade to a previous version, a modification would have to be made to iTunes and you would still have to use some modified version of like iReb to trick the iPad into taking any version, like a custom FW.
    But this would only apply to Limera1n devices if a bootrom hack can't be found.
     
  8. f4780y

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    No. A custom firmware still relies on shsh blobs. There is no way round that. It's a much more complicated issue, and no iTunes or iReb mod would fix it. If it was a problem which could be solved in such a way then the issue of baseband downgrades would have been solved a long time ago...
     
    #8 f4780y, Oct 31, 2011
    Last edited: Oct 31, 2011
  9. graywolf

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    So even if someone found a way to completely disable the shsh check of iTunes, you still couldn't load an earlier version?
     
  10. f4780y

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    ITunes is just the middle-man. The check is cooked into both the firmware and the device (at the hardware level).
     

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