Why Nobody Can Verify What Booted Your Server
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Boot verification challenges, crucial for server security in cloud infra.
Summary
TPM-measured boot generates combinatorial PCR values (e.g., PCRs 0,4,8,9,11,12) via irreversible hash chains, but no public registry exists due to non-determinism acknowledged by the TCG. UEFI event logs provide detailed measurements but are often opaque, hindering fleet-wide verification for compliance and remote attestation in cloud VMs.