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Gatekeeper: what it actually does and how to read its decisions
The gauntlet every newly-downloaded app passes through — quarantine xattr, signature check, notarization check, user prompt. Where each decision is made and how to debug it.
securitygatekeepernotarizationcode-signing
Code signing chain of trust: from binary to Apple's root
Every Mach-O on a Mac is signed; every signature chains to an Apple root cert. Here's what the kernel actually verifies, what notarization adds, and how the SEP roots it all.
securitycode-signingnotarizationamfi