Apple introduced per-device firmware signing (SHSH blobs) in the iPhone 3GS to stop people from downgrading (as a jailbreaking deterrent).
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/ …
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@marcan42 as an american company, apple could be (have been?) served with an NSL to disclose signing keys. - Show replies
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@marcan42 why? The technique could be - the firmware just needs to be signed again which Apple does in the blink of an eye. -
@maciekish They're implying that the mere existence of such a tool is per se a security threat, which it isn't. - Show replies
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