HSMs, TPMs, Secure Enclaves, and YubiKeys all promise the same thing — the key never leaves the chip — and they all address subtly different threat models with very different costs and capabilities. We walk what each one actually protects against, the attestation chain that proves a key lives where it claims to, the physical-tamper story, and the honest limits.
Tpm
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Hardware Security Modules and Secure Enclaves -
BIOS/UEFI Deep Dive: Boot Phases, Secure Boot, Measured Boot, and TPM What's really happening before your OS loads — UEFI boot phases, Secure Boot, Measured Boot, and the TPM — explained well enough to debug boot failures, sign your own kernel modules, and understand the modern firmware attack surface.
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LUKS and Full-Disk Encryption: Root Partitions, TPM Unlock, and Key Management Full-disk encryption on Linux with LUKS beyond the installer defaults — how dm-crypt and LUKS headers work, keyslot and key rotation, TPM-backed and automated unlock, and a recovery plan for when you need one years later.