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Every iOS binary is signed; the signature is verified at every load. Entitlements are signed-in capability declarations: which sandbox extensions, which keychain groups, which background modes. Lose codesigning enforcement (e.g. via a jailbreak) and the whole security model becomes advisory; the App Store + codesigning is the trust anchor.
Workflow: developer signs binary with Apple-issued cert; binary contains entitlements blob; iOS kernel verifies signature on every load (page-fault granularity since iOS 10+). Jailbreaks defeat this by patching kernel checks; signed binaries from outside the Store don't run otherwise.
codesign --display --entitlements - (macOS). Note the entitlements.Use these three in order. Each builds on the one before.
In one paragraph, explain iOS codesigning and entitlements.
Walk me through what happens when an iOS app loads from the App Store.
Compare iOS codesigning enforcement evolution from iOS 8 to iOS 17.