Establishing unassailable cryptographic roots of trust in avionics silicon to verify every line of executed machine code.
Upon system power-up, immutable on-die ROM executes first, validating cryptographic signatures on secondary bootloaders using public keys burned into write-once silicon eFuses.
Avionics HSMs isolate aircraft private keys, operational flight program (OFP) decryption keys, and ADS-B authentication credentials inside active zeroization enclosures that erase secrets if physical intrusion is detected.