Zero-Trust Architecture for Internal Flight Buses: Why Perimeter Defenses Are Not Enough

Core aerospace engineering and protocols for Zero-Trust Avionics Buses.

The Fallacy of Physical Cable Security in Aviation

Historically, avionics engineers assumed that because data cables were physically routed inside an aircraft's fuselage, all traffic on those buses was inherently trustworthy. This assumption fails in the era of connected maintenance laptops and multi-tier third-party supply chains.

Cryptographically Enforced Internal Bus Verification

SecureEvtol implements zero-trust networking directly on internal aircraft buses: flight control computers, rotor motor inverters, and battery management nodes authenticate each other with micro-mTLS. A malicious rogue device tapped into a CAN wire cannot issue commands because it lacks the hardware-anchored cryptographic keys required to sign packets.

Eliminating Implicit Trust: Never trusting a CAN or Ethernet packet based on physical wire connection.
Micro-mTLS 1.3: Low-overhead mutual TLS designed for embedded aerospace microcontrollers.
HMAC Message Authentication Codes: Tagging every actuator command with 128-bit cryptographic MACs.
Bus Injection Immunity: Rejecting unauthorized injected packets within microseconds.

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