This isn’t because there’s no way to secure CAN communications, mind you. A strong implementation (and in fact, the industry standard) would involve two CAN security features, in addition to the implementation of firmware-level unique keys and ECDSA/RSA firmware signing. UDS Service 0x29 (introduced in ISO 14229-1:2020) uses asymmetric PKI-based certificate exchange for user authentication, and AUTOSAR SecOC for per-message authentication and freshness validation, preventing replay attacks. While these modifications would add some additional time to the firmware write operations, the Arm Cortex-M4 core included in the ECU’s XMC4500 is very efficient at cryptographic functions and the total delta would likely be only about 6 seconds.4 5 6
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