To provide an unauthorized control restraint method capable of appropriately restraining unauthorized control due to an authorized frame circulating on a network.SOLUTION: An unauthorized control restraint method is performed by an unauthorized control restraint device 4100 connected with a bus 300 in a network system including a plurality of electronic control units that exchange a plurality of frames including a control frame to give instruction of prescribed control on a control target and a state frame including information on a state of the control target via the bus 300, i.e. a communication path. The unauthorized control restraint method includes: a reception step of sequentially receiving a plurality of frames from the communication path; and a determination step of determining whether to restrain prescribed control based on the received control frame, on the basis of a prescribed reference which is satisfied when a state of the control target in a prescribed period identified based on a set of state frames received within the prescribed period prior to reception of the control frame is a change frequent occurrence state, and is not satisfied when the state of the control target is not the change frequent occurrence state.SELECTED DRAWING: Figure 28

    【課題】ネットワークに流される不正なフレームによる不正な制御を適切に抑止し得る不正制御抑止方法を提供する。【解決手段】制御対象に対して所定制御を指示する制御フレーム及び制御対象の状態の情報を含む状態フレームを含む複数のフレームの授受を、通信路であるバス300を介して行う複数の電子制御ユニットを備えるネットワークシステムにおいて、バス300に接続された不正制御抑止装置4100で行われる不正制御抑止方法は、通信路から複数のフレームを逐次受信する受信ステップと、受信された制御フレームに基づく所定制御を抑止すべきか否かを、その制御フレームの受信時に先行する所定期間内に受信された状態フレームの集合に基づいて特定される当該所定期間における制御対象の状態が、変化多発状態である場合に満たされ変化多発状態でない場合に満たされない所定基準に基づいて、判定する判定ステップとを含む。【選択図】図28


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    Title :

    UNAUTHORIZED CONTROL RESTRAINT METHOD, UNAUTHORIZED CONTROL RESTRAINT DEVICE, AND ON-VEHICLE NETWORK SYSTEM


    Additional title:

    不正制御抑止方法、不正制御抑止装置及び車載ネットワークシステム


    Contributors:

    Publication date :

    2021-03-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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