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SHSH blob
SHSH blob is a term for a small piece of data that is part of Apple's digital signature protocol for iOS restores and updates, designed to control the iOS versions that users can install on their iOS devices (iPhones, iPads, iPod touches, and Apple TVs), generally only allowing the newest iOS version to be installable. Developers interested in iOS jailbreaking have made tools for working around this signature system in order to install jailbreakable older iOS versions that are no longer being signed by Apple.
== Technical details ==
"SHSH blobs" (also called "ECID SHSH") is an unofficial term referring to the digital signatures that Apple generates and uses to personalize IPSW (iOS software) files for each device; they are part of Apple's protocol designed to ensure that trusted software is installed on the device. Apple's public name for this process is System Software Personalization.
SHSH blobs are created by a hashing formula that has multiple keys, including the device type, the iOS version being signed, and the device's ECID (a unique identification number embedded in its hardware). When Apple wishes to restrict users' ability to restore their devices to a particular iOS version, Apple can refuse to generate this hash during the restore attempt, and the restore will not be successful (or at least will require bypassing the intended function of the system).
This protocol is part of iPhone 3GS and later devices.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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