Symmetric key exchange via TLS (transport layer security) on the CAN (controller area network) bus interface

Abstract

SUMMARY Symmetric key exchange over TLS on a CAN bus interface for multiple devices. The key exchange is configured to elect a master PCA pump for a CAN bus network and prevent two PCA pumps from being master. Upon joining the CAN bus network, PCA pumps exchange their MAC addresses with the other PCA pumps on the network. After the startup timeout, each PCA pump compares all MAC addresses to determine if it should proceed to the voting phase. If the PCA pump has the lowest MAC address, it enters the voting phase. During the voting phase, the PCA pump sends master requests to all other PCA pumps on the network. If the PCA pump's internal vote counter reaches three, it becomes the key master.