PROBLEM TO BE SOLVED: To enhance security property against illegal authentication that utilizes radio communication.SOLUTION: A portable machine 2 includes: a Q value estimation part 217 which estimates a Q value of an LF transmission antenna 6 by using a reception voltage of an LF signal that is transmitted from BCM; and an illegality decision part 221 which decides presence/no presence of illegality depending on whether or not the Q value estimated at the Q value estimation part 217 agrees with an expected value of the Q value of the LF transmission antenna 6. In a case where the illegality decision part 221 decides that there is no illegality and code collation is established at a code collation part 213, a response signal is returned from an RF driver 24 to the BCM, and on the other hand, in a case where the illegality decision part 221 decides that there is illegality, no response signal is returned from the RF driver 24.SELECTED DRAWING: Figure 4

    【課題】無線通信を利用した不正な認証に対するセキュリティ性をより高める。【解決手段】携帯機2は、BCMから送信されるLF信号の受信電圧を用いてLF送信アンテナ6のQ値を推定するQ値推定部217と、Q値推定部217で推定したQ値と、LF送信アンテナ6のQ値の期待値とが一致するか否かによって不正の有無を決定する不正決定部221とを備え、不正決定部221で不正無しと決定するとともにコード照合部213でのコード照合が成立した場合に、RFドライバ24からBCMへレスポンス信号を返信する一方、不正決定部221で不正有りと決定した場合には、RFドライバ24からレスポンス信号を返信しない。【選択図】図4


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    Titel :

    AUTHENTICATION SYSTEM AND PORTABLE MACHINE


    Weitere Titelangaben:

    認証システム、及び携帯機


    Beteiligte:

    Erscheinungsdatum :

    13.07.2017


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

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



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