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shsh

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In computing, a SHSH blob is a digital signature that Apple generates and uses to personalize IPSW firmware files for each iOS device. SHSH blobs are part of Apple's protocol designed to ensure that only 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 (before iOS 7, System Software Personalization). The term “SHSH blob” is unofficial and based on abbreviations for signed hash and binary large object. An alternative term, ECID SHSH, refers to the device's ECID, a unique identification number embedded in its hardware)
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.

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