Hardware Secure Boot & UNECE R156 SUMS Compliance

Protecting vehicular firmware against unauthorized tampering, tuning exploits, and supply chain corruption.

Hardware Root of Trust Boot Sequencing

At power-on, the AutoHSM hardware core releases its internal reset while holding the vehicle's main application CPU in reset. The HSM calculates the SHA-256 hash of the application flash and validates the OEM digital signature before allowing the main engine or braking software to execute.

Secure FOTA Decryption and Flashing

Firmware packages received over cellular links are decrypted on-the-fly using hardware keys, verified against OEM root certificates, and flashed to passive memory partitions, enabling atomic rollback if installation faults occur.

Zero-Downtime Flashing: Dual-bank A/B memory swapping with background cryptographic verification.
Anti-Rollback Protection: Hardware-fused monotonic counters preventing downgrade attacks to vulnerable firmware.
Sub-15ms Boot Latency: High-speed hardware hashing ensuring vehicle readiness without delaying engine start.
UNECE R156 Alignment: Generating cryptographic proof-of-update for Software Update Management Systems.

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