Security processing method and server

A server for counteracting an anomalous frame transmitted on an on-board network of a single vehicle, the server comprising:

• processing circuitry;
• and
• a storage including at least one set of instructions that, when executed by the processing circuitry, causes the processing circuitry to perform operations including:
• acquiring information about multiple frames received on one or multiple on-board networks of one or multiple vehicles, the one or multiple vehicles including the single vehicle;
• and
• assessing, based on the acquired information about the multiple frames and information about a frame received on the on-board network of the single vehicle acquired after an acquisition with respect to the multiple frames, an anomaly level of the frame received on the on-board network of the single vehicle.

A security processing method, executed by a computer, for counteracting an anomalous frame transmitted on an on-board network of a single vehicle, the security processing method comprising:

• assessing, by the computer, an anomaly level of a frame received on the on-board network of the single vehicle;
• and
• deciding, by the computer, whether or not to transmit transmission information to vehicles having a certain relationship with the single vehicle in accordance with the assessed anomaly level;
• and
• controlling, by the computer, a transmission of the transmission information by following a decision of the deciding.