In the scope of the EVITA project, we present an approach to secure the vehicular on-board communication architecture. Computing devices range from simple low-cost sensor control units on low-speed buses to costly multimedia units on high-speed buses, which allow for customized applications. Our architectural approach combines hardware- and software measures and integrates them with cryptographic protocols. These are designed for compatibility with today's vehicular bus systems like CAN or FlexRay networks, as well as upcoming systems such as IP/Ethernet. In this paper, we present the security architecture and protocols defined in EVITA, explain these on the vehicle-to-vehicle Active Brake scenario and present results of our prototype implementation and simulations.
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