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arXiv · 2502.20555

Robust Multicast Origin Authentication in MACsec and CANsec for Automotive Scenarios

Gianluca Cena·Lucia Seno·Stefano Scanzio
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Abstract

Having everything interconnected through the Internet, including vehicle onboard systems, is making security a primary concern in the automotive domain as well. Although Ethernet and CAN XL provide link-level security based on symmetric cryptography, they do not support origin authentication for multicast transmissions. Asymmetric cryptography is unsuitable for networked embedded control systems with real-time constraints and limited computational resources. In these cases, solutions derived from the TESLA broadcast authentication protocol may constitute a more suitable option. In this paper, some such strategies are presented and analyzed that allow for multicast origin authentication, also improving robustness to frame losses by means of interleaved keychains. A flexible authentication mechanism that relies on a unified receiver is then proposed, which enables transmitters to select strategies at runtime, to achieve the best compromise among security, reliability, and resource consumption.

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Gianluca Cena, Lucia Seno, Stefano Scanzio. 2025-02-27. Robust Multicast Origin Authentication in MACsec and CANsec for Automotive Scenarios. https://arxiv.org/abs/2502.20555

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