Poster: Simple key management scheme for in-vehicle system

In this study, we propose a key management scheme by considering the life cycle of a vehicle. The proposed scheme comprises electronic control unit (ECU), authentication ECU (A-ECU), and configuration server systems. The A-ECU manages shared key delivery within the vehicle. The configuration server passes vehicle configuration information to the A-ECU. For secure on-demand sharing of pre-shared keys between the A-ECU and ECUs, we use a one-time pad encryption. Sharing pre-shared key by one-time pad encryption is performed between ECUs and the A-ECU to achieve secure shared key delivery. With the proposed scheme, neither key generation information nor the key itself needs to be shared between manufacturers. Therefore, while reducing the risk of key leakage, it is possible to reduce the administrative costs associated with keys.