The modern car is controlled by a large number of Electronic Control Units (ECUs), which communicate over a network of bus systems. One of the most widely used bus types is called Controller Area Network (CAN). Recent automotive hacking has shown that attacks with severe safety impact are possible when an attacker manages to gain access to a safety-critical CAN. In this paper, our goal is to obtain a more systematic understanding of the capabilities of the CAN attacker, which can support the development of security concepts for in-vehicle networks.
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