Password = 1234
It has just been reported that the new iOS 5 is going to halt SHSH firmware downgrades on iPhone, iPad and iPod Touch. This is really bad news for all those jailbreakers and it comes as the Dev Team begin explaining what Apple�s iOS 5 betas are revealing. It seems Apple is determined to combat SHSH blobs moving forward and Apple are aggressively combating the replay attacks that have allowed users to use iTunes to restore to previous firmware versions using saved SHSH blobs.
Apple has stated to make more use of the APTicket once you install iOS 5 and beyond and they will be checking on each boot of an iDevice. The problem for jailbreakers is that the APTicket will be uniquely generated every time an iPhone, iPad or iPod touch is restored and this means that existing methods of saving SHSH blobs will no longer work. Apple are also making sure that they are the only ones that will know what the APTicket should be.
APTIcket is changing starting with iOS 5 and it is being used like the BBTicket. The LLB and iBoot stages of the boot sequence are also being refined to depend on the authenticity of the APTicket. This is going to happen at every boot and because Apple has the crypto keys to properly sign the per-restore APTicket, replayed APTickets are useless.
According to the Dev Team this points to a new approach from Apple but until Apple brings out the final release of iOS 5 the Dev Team are still guessing at what Apple are planning to do.
There is still a little bit of good news for jailbreakers and Geohot�s Limera1n which takes effect before any APTicket checks are made could still provide a tethered jailbreak solution. As this is also only going to affect restores starting at iOS 5 and onward Geohot�s Limera1n exploit will work and so should any other tethered jailbreaks.
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