: An ancient relic from the iOS 4 days that first allowed users to hoard these signatures.
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In older versions of iOS (pre-iOS 5), saving blobs was relatively simple because the request data was fixed. To prevent users from simply replaying old signatures, Apple introduced a (a number used once)—a random value generated for each restore request. Modern downgrading requires a "Nonce collision" or a specific "Generator" to make saved blobs valid for a restore. Summary Table: Blobs at a Glance Description Requirement shsh blobs