LiBrA-CAN: Lightweight Broadcast Authentication for Controller Area Networks

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Provided by: Politecnico di Torino
Topic: Security
Format: PDF
Despite realistic concerns, security inside vehicular buses (such as CAN) is still absent mostly due to technical challenges: low bandwidth and processing power, low cost margins, etc. Here, the authors design an efficient protocol based entirely on simple symmetric primitives that takes advantage of two interesting procedures which they call key splitting and MAC mixing. Rather than achieving authentication independently on each node, they share keys between groups of nodes which leads to a higher security level in case when compromised nodes form only a minority.
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