To provide a method for enhancing accuracy of determination of a relay attack.SOLUTION: A relay attack determination device comprises: a strength measurement unit 38 that is provided in a portable machine 3 and measures reception strength a plurality of times for each of two request signals received from an on-vehicle machine; a comparison unit 44 that by using the average value of the reception strength measured by the strength measurement unit 38, performs comparison processing on the two request signals and determines a relay attack on the basis of a result of the comparison processing; and a variation calculation unit 42 that with respect to a request signal, calculates a variation in reception strength measured the plurality of times by the strength measurement unit 38. The comparison unit 44, when the variation in reception strength exceeds a threshold indicating communication abnormal with respect to the request signal, determines a relay attack regardless of a result of the comparison processing.SELECTED DRAWING: Figure 4

    【課題】リレーアタックの判定の精度を高める方法を提供する。【解決手段】リレーアタック判定装置の強度測定部38は、携帯機3に設けられ、車載機から受信した2つのリクエスト信号のそれぞれについて、複数回ずつ受信強度の測定を行う。比較部44は、強度測定部38が測定した受信強度の平均値を用いて、2つのリクエスト信号どうしの比較処理を行い、比較処理の結果に基づいて、リレーアタックを判定する。ばらつき演算部42は、リクエスト信号について、強度測定部38で複数回ずつ測定された受信強度のばらつきを演算する。比較部44は、リクエスト信号において、受信強度のばらつきが、通信異常を示す閾値を超えた場合、比較処理の結果によらず、リレーアタックを判定する。【選択図】図4


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    Title :

    RELAY ATTACK DETERMINATION DEVICE


    Additional title:

    リレーアタック判定装置


    Contributors:
    MORI YUKI (author)

    Publication date :

    2021-06-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    E05B LOCKS , Schlösser / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H04B TRANSMISSION , Übertragung / H04Q Wähltechnik , SELECTING



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