AP AP AP AP AP AP AP( AP) AP AP( AP) AP AP Air Patrol[1] Air Patrol Cirond AP AP Air Patrol Senser Air Patrol Senser AP AP Air Patrol Senser AP

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AP AP 1,a) 2,b) LAN LAN AP LAN AP LAN AP Proposal of a System to Estimate the Location of Unknown Wireless APs by Utilizing the Signal Strength and Location Information of the Known APs Yoshiaki Tahara 1,a) Hideo Masuda 2,b) Abstract: Recently, more organizations are using the wireless LAN infrastructure because of the widespread of the wireless technology. However, there are new problems about wireless LAN access points (AP) such as vulnerabilities in the security aspects or unauthorized establishments of access points at certain locations. Thus, there is a need to identify and address these problems before they occur. Therefore, in this study, I have proposed and evaluated a system to estimate the locations of the unknown or unauthorized wireless APs by utilizing the information obtained from the known or authorized establishments of wireless APs. 1. LAN LAN AP AP AP 1 Graduate School of Information Science, Kyoto Institute of Technology 2 Center for Information Science, Kyoto Institute of Technology a) y-tahr14@dsm.cis.kit.ac.jp b) h-masuda@kit.ac.jp MAC AP AP AP AP AP AP AP EvilTwin [2] LAN AP AP AP 1

AP AP AP AP AP AP AP( AP) AP AP( AP) AP AP 2. 2.1 Air Patrol[1] Air Patrol Cirond AP AP Air Patrol Senser Air Patrol Senser AP AP Air Patrol Senser AP Air Patrol Enterprise software Air Patrol Senser AP LAN AP Air Patrol Senser 2.2 Particle Filter[4] LAN Wireless Search Assistant Wireless Search Assistant GPS[3] PC Wireless Search Assistant GPS ( ) AP AP Wireless Search Assistant AP AP 2.3 Place Engine[5] PlaceEngine AP LAN GPS GPS GPS PlaceEngine AP MAC PlaceEngine 3 BSSID(MAC ) SSID( ) RSSI(Received Signal Strength Indicator ) PlaceEngine AP PlaceEngine ( 1 ) AP AP (MAC ) ( 2 ) AP PlaceEngine ( 3 ) PlaceEngine AP AP PlaceEngine AP AP AP 3. 2

3.1 AP LAN AP 3.2 AP AP AP (SSID) AP AP LAN LAN GPS 4. AP AP scan scan search scan AP AP scan search AP AP 1 scan 4.1 scan scan AP AP LAN AP MAC ESSID AP AP iwlist scan iwlist scan 2 AP 4.2 search search scan AP AP AP search ( 1 ) scan ( 2 ) 4.2.2 AP AP AP AP AP ( 3 ) 4.2.3 AP 4.2.1 AP AP GPS 4.2.2 MAC AP AP AP AP AP PC AP MAC search AP MAC MAC AP AP MAC AP AP 4.2.3 AP AP AP AP AP AP AP 3

4 AP 1 5 AP 38 2 iwlist scan 6. 3 AP AP(A) AP AP AP(B) AP(A) A AP(B) B AP AP AP AP 5. AP AP 1 2 scan AP 3 MAC AP AP 4 search AP 5 2-4 AP scan AP 6.1 3 AP 4 16 38 38 4 38 4 38 AP 4 4 AP 4 AP 5 3 100 AP AP 1 PC Aspire V5 V5-131-N14D LAN broadcom 802.11n network adapter 1 AP BUFFALO WZR-AMPG300NH/P 2 AP Cisco Aironet 1130AG 3 AP Cisco Aironet 1130AG AP Cisco Aironet 1130AG Cisco Aironet 1142N Cisco Aironet 2602I 0 000001 4

情報処理学会研究報告 図 6 実験 1 16 箇所 図 9 図 7 実験 1 38 箇所 図 10 図 8 実験 2 16 箇所 実験 2 38 箇所 実験 1 38 箇所中 4 箇所 未知 AP の候補位置の最小単位とした 図 11 実験 2 38 箇所中 4 箇所 6.2 実験結果 位置推定精度を評価するために 3 つの実験を行った 実 験 1 の結果はそれぞれ図 6 図 7 図 8 実験 2 の結果はそ れぞれ図 9 図 10 図 11 実験 3 の結果はそれぞれ図 12 図 13 図 14 である 6.3 評価 得られた実験結果を位置推定精度の観点から評価する 図 6 9 12 と図 7 10 13 を比較すると 観測箇所の増 図 12 実験 3 16 箇所 図 13 実験 3 38 箇所 加による推定精度の変化は小さいことが分かる また図 7 10 13 と図 8 11 14 を比較すると 位置推定に用いる データの厳選によって推定精度の向上が見られた これら の結果から 位置推定精度の向上には観測箇所数の増加で はなく推定に用いる観測データの検討が必要であると考え られた 最も精度が高かった 38 箇所中 4 箇所を位置推定 に用いた結果である図 8 11 14 では未知 AP があると考 えられる候補の範囲は約半径 15m の円内であった 候補 範囲を部屋単位以下にするには 更なる精度の向上が必要 である 7. まとめ 本論文では既知 AP の位置情報と受信信号品質 またか ら取得した位置情報を用いて未知 AP の位置推定を行うシ 図 14 実験 3 38 箇所中 4 箇所 ステムの提案と評価を行った 6.3 節の比較 評価では 38 2015 Information Processing Society of Japan 5

4 AP ios Android JSPS 26330104 [1] : AirPatrol, http://www.cirond.com/. [2] Litner, H., Keeler, B. and Serotte, L.: AirDefense Discovers New Version of Evil Twin At-tack at Interop 2005, http://www.airdefense.net/newsandpress/01 24 05.shtm (2005). [3] GPS (GPS ). B, Vol. 84, No. 12, pp. 2082 2091 (2001). [4] Particle Filter LAN ( 1: ). MBL, [ ] pp. 15 22 (2006). [5] PlaceEngine WiFi - pp. 95 104 (2006). 6