Implementation and Evaluation of Lightweight in-Vehicle Security Switch with Hierarchical Hash Table

As a result of the growth of autonomous driving technology, vehicle networks increasingly require not only broadband capabilities and real-time communication, but also enhanced security features. In this paper, we propose a lightweight security switch using hierarchical hash table to achieve security functionality at the central gateway within the vehicle network. Our proposed switch combines header information from Layer-2 to Layer-4 to determine whether incoming packets are attack packets or not. It also achieves fast packet forwarding using low-latency hierarchical hash table. We evaluated the system performance with the FPGA board implementing the proposed security switch, and achieved low-latency transfers of 500 nanoseconds or less.