Management server

The management server includes a memory and a processor. The memory stores, in addition to the certificate data, vehicle identification information for identifying a vehicle and ECU identification information for identifying an ECU mounted in the vehicle at the time of issuing the certificate data. The processor executes: an acquisition process for communicating with a specific vehicle on which an ECU is mounted, and acquiring specific vehicle identification information and ECU identification information for identifying the specific vehicle; and a first transmission process in which, in a first case where a combination of specific vehicle identification information acquired from a specific vehicle and ECU identification information is not stored in the memory, a first command for deleting the certificate data stored in the ECU is transmitted to the specific vehicle. 管理服务器具备存储器和处理器。存储器除了证书数据之外，还存储有用于识别车辆的车辆识别信息和用于识别在证书数据的发行时搭载于车辆的ECU的ECU识别信息。处理器执行：取得处理，与搭载有ECU的特定的车辆通信，取得用于识别特定的车辆的特定的车辆识别信息和ECU识别信息；及第一发送处理，在从特定