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How to check if your Apple Silicon Mac is booting securely
How to check your Mac is booting in Full Security, and how to read its log to verify all the key steps involved in that process.
How Secure Boot works Apple silicon Macs have a small ROM to support DFU mode in case a full Restore is required, and to check and load the first stage of the ‘firmware’, the Low-Level Bootloader or LLB. When it’s ready, the kernel validates the root hash for the SSV snapshot, as noted above, enabling the boot process to proceed to load and run other parts of macOS. The remaining hash checking of the SSV, to confirm that it’s exactly as Apple intends, proceeds in a ‘lazy’ fashion, as access is needed to its contents.
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