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- A SHSH blob (based on the acronyms for signed hash and binary large object; also called ECID SHSH, referring to the device's ECID, a unique identification number embedded in its hardware) is an unofficial term referring to the digital signatures that Apple generates and uses to personalize IPSW firmware files for each iOS device. They are part of Apple's protocol designed to ensure that trusted software is installed on the device, generally only allowing the newest iOS version to be installable. Apple's public name for this process is System Software Authorization (formerly called System Software Personalization before iOS 7). This process is controlled by the TATSU ("TSS") Signing Server (gs.apple.com) where updates and restores can only be completed by iTunes if the version of iOS is being signed. 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. (en)
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- this author should have been published in a reliable secondary source on this matter, such as a computer engineering journal (en)
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- A SHSH blob (based on the acronyms for signed hash and binary large object; also called ECID SHSH, referring to the device's ECID, a unique identification number embedded in its hardware) is an unofficial term referring to the digital signatures that Apple generates and uses to personalize IPSW firmware files for each iOS device. They are part of Apple's protocol designed to ensure that trusted software is installed on the device, generally only allowing the newest iOS version to be installable. Apple's public name for this process is System Software Authorization (formerly called System Software Personalization before iOS 7). (en)
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