boot
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iBoot stage (main bootloader) security on macOS
How iBoot on Apple Silicon Macs acts as the final secure gate before macOS launches by verifying signed boot assets, enforcing memory and hardware protections, validating the SSV, and making boot-level compromise significantly harder than attacks against the kernel or user space.
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Low-Level Bootloader (LLB) Security on macOS
Overview of the Apple Silicon Low-Level Bootloader. Explains how LLB verifies firmware, enforcing SEP-signed LocalPolicy and anti-replay.
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Boot ROM Security on Silicon Macs (M1/M2/M3)
A overview of Apple Silicon Boot ROM security. Explains how SecureROM anchors the boot chain of trust, and exploits surrounding it.