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A platform for research: civil engineering, architecture and urbanism
COMMUNICATION CORRECTNESS DETERMINATION SYSTEM
PROBLEM TO BE SOLVED: To provide a communication correctness determination system capable of making relay attacks difficult.SOLUTION: If reception data is maintained at an L level for a while after the reception data falls to the L level derived from a transmission wave from a vehicle, a reception threshold value changes to downturn involved in fall to the L level, and then when it is maintained at the L level for a long period, the reception threshold eventually reaches a minimum value, and when the reception data rises to an H level, the reception threshold value changes to upward. Under such a premise, by slowing the rise of a transmission radio wave by switching of a Q value, it becomes possible to change demodulation data length as a base point using any position of a slowly rising part to the H level about the reception data. Then, if the demodulation data length is within a prescribed range, radio communication between a vehicle and a mobile device is determined to be normal communication, and on the other hand if the demodulation data length is out of the prescribed range, the radio communication is determined to be unauthorized communication.SELECTED DRAWING: Figure 2
【課題】リレーアタックを困難にすることを可能にした通信正否判定システムを提供すること。【解決手段】車両からの送信電波に由来して、受信データがＬレベルへ立ち下がった後、しばらくの間、Ｌレベルで維持される場合、Ｌレベルへの立ち下がりに伴って受信閾値が下降に転じ、その後にＬレベルで維持される期間が長いとき、受信閾値はやがて最小値となり、受信データがＨレベルへ立ち上がると、受信閾値が上昇に転じる。こうした前提のもと、Ｑ値の切り替えにより送信電波の立ち上がりを鈍らせることで、受信データについてＨレベルへ緩やかに立ち上がる部分の任意の位置を基点に復調データ長を変動させることが可能になる。そして、復調データ長が規定範囲内の場合に、車両と携帯機との無線通信が正規通信と判定される一方、復調データ長が規定範囲外の場合に、該無線通信が不正通信と判定される。【選択図】図２
COMMUNICATION CORRECTNESS DETERMINATION SYSTEM
PROBLEM TO BE SOLVED: To provide a communication correctness determination system capable of making relay attacks difficult.SOLUTION: If reception data is maintained at an L level for a while after the reception data falls to the L level derived from a transmission wave from a vehicle, a reception threshold value changes to downturn involved in fall to the L level, and then when it is maintained at the L level for a long period, the reception threshold eventually reaches a minimum value, and when the reception data rises to an H level, the reception threshold value changes to upward. Under such a premise, by slowing the rise of a transmission radio wave by switching of a Q value, it becomes possible to change demodulation data length as a base point using any position of a slowly rising part to the H level about the reception data. Then, if the demodulation data length is within a prescribed range, radio communication between a vehicle and a mobile device is determined to be normal communication, and on the other hand if the demodulation data length is out of the prescribed range, the radio communication is determined to be unauthorized communication.SELECTED DRAWING: Figure 2
【課題】リレーアタックを困難にすることを可能にした通信正否判定システムを提供すること。【解決手段】車両からの送信電波に由来して、受信データがＬレベルへ立ち下がった後、しばらくの間、Ｌレベルで維持される場合、Ｌレベルへの立ち下がりに伴って受信閾値が下降に転じ、その後にＬレベルで維持される期間が長いとき、受信閾値はやがて最小値となり、受信データがＨレベルへ立ち上がると、受信閾値が上昇に転じる。こうした前提のもと、Ｑ値の切り替えにより送信電波の立ち上がりを鈍らせることで、受信データについてＨレベルへ緩やかに立ち上がる部分の任意の位置を基点に復調データ長を変動させることが可能になる。そして、復調データ長が規定範囲内の場合に、車両と携帯機との無線通信が正規通信と判定される一方、復調データ長が規定範囲外の場合に、該無線通信が不正通信と判定される。【選択図】図２
COMMUNICATION CORRECTNESS DETERMINATION SYSTEM
通信正否判定システム
DOI YOSUKE (author)
2018-05-10
Patent
Electronic Resource
Japanese
WIRELESS COMMUNICATION CORRECTNESS/INCORRECTNESS DETERMINING SYSTEM
| European Patent Office | 2019
| Online Contents | 2012