IPSJ SIG Technical Report Vol.2009-ITS-37 No /6/ ( ) (ITS:Intelligent Transport Systems) 1 Floating Car Data(FCD, XFCD) 1) 200

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1 ( ) (ITS:Intelligent Transport Systems) 1 Floating Car Data(FCD, XFCD) 1) )3)4) Anonymous Authentication Protocol for Probe Vehicle Information System MASAAKI SATO, 1 RIE SHIGETOMI, 2 NORIMICHI UEDA, 4 CONGWEI DANG, 4 MICHIKO IZUMI, 3 KEISUKE UEHARA, 1 HIDEKI SUNAHARA 1 and JUN MURAI 1 In the current Probe Vehicle Information system, collected information includes the position and the time when the vehicle obtained the information. In order to protect the privacy, a vehicle should not be identified by the collected information. For the information collector, it is better to eliminate the possibility of the attacks to the system using the information such as identity thief or fallaciousness by malicious third party. In order to generate high quality service, continuous information such as the travel time on a road is required. In this paper, we proposed the anonymous authentication system for developing the probe vehicle information system considering the privacy. By utilizing the proposed system, probe information can be collected continuously while keeping the anonymity of the information sender. The proposed system was designed and developed in order to verify the feasibility of the proposed system using probe vehicle simulator. 1. 5) 2. 1 Faculty of Keio University 2 National Institute of Advanced Industrial Science and Technology 3 Faculty of Nara Institute of Science and Technology 4 NEC 1st Government Solutions Division,NEC Soft,Ltd. 1 c 2009 Information Processing Society of Japan

2 認証情報の認証情報の 認証局認証情報認証情報 プローブプローブデータ 情報発信者情報収集者 ( 自動車 ) 通信基盤 ( プローブ情報センタ ) プローブデータ 1 Fig. 1 Model of Probe Vehicle Information System 3. 1 発行 認証情報 プローブデータ の発信 検証 データプール 2 c 2009 Information Processing Society of Japan

3 ID () 1 1 Table 1 Classification of Anonymous Credential One-show Multi-show Refresh scheme 3 ( 1 ) ( ) ( ( 2 ) ) ( 3 ) 4. Refreshable scheme 4.1 6) One-show Multi-show 3 c 2009 Information Processing Society of Japan

4 ( ) Refreshable scheme 7)8)9) (refresh) ( 6 ) Trace refresh ( ) Refreshable scheme Issue Refresh Refreshable scheme Present Refreshable scheme 4.2 Refreshable scheme Refreshable scheme Untraceability Refreshable scheme 2 (2) Issue ( 本人確認と初期 Token 配布 ) 利用者 (3) Refresh (Token の更新 ) 発行者 (6) Trace ( 多重利用の追跡 ) (4) Present(Token の利用 ) (1) KeyGeneration( 鍵の登録 ) サービス提供者 (5) Verify( の正当性確認 ) 2 Refreshable scheme Fig. 2 Overview of Refreshable scheme ( 1 ) KeyGeneratoin ( 2 ) Issue ID ID ( 3 ) Refresh 4 Refreshable scheme ( ) ( 4 ) Present ( Unlinkability 3 ) Anonymity ( 5 ) Verify Present Unlinkability Untraceability Unlinkability Double-Use Traceability Refreshable scheme Traceability ( ) Refreshable scheme Refreshable scheme Linkability 4 c 2009 Information Processing Society of Japan

5 一定期間経過したため Refreshable scheme Present 車両 B Linkability Unlinkability linkability Refreshable scheme 10) 車両 A 認める期間は linkability あり車両 C 3 Fig. 3 Concept of Anonymous Authentication for Probe Vehicle Information System ( ) present Linkability 3 A present 5 ( 3 ) 6.1 ( Linkability ) Linkability Unlinkability 3 4 A B C A Refreshable scheme ( 1 ) KeyGeneration ( 2 ) Issue 情報発信者が 6. の更新により情報を切断 切断後は 切断前の自動車との linkability は無いため 追跡が不可能 5 c 2009 Information Processing Society of Japan

6 (2) Issue プローブ認証局 個人情報 (1) KeyGeneration 1 ID 認証と の発行 / 更新 匿名認証管理サーバ 5 の更新制御 (3) Refresh (6) Trace Fig. 4 自動車 プローブデータ (4) Present (7) Anchor( 期限付き共通鍵送信 ) (8) Send( プローブデータ発信 ) プローブ情報センタ プローブデータプール (5) Verify 4 Model of Anonymous Authentication for Probe Vehicle Information System 5 Fig. 5 Acquisition Procedure of Vehicle Information ID ID ( 3 ) Refresh ( ) ( 4 ) Present ( 5 ) Verify Present 6 ( ) ( 6 ) Trace refresh 管理サーバ匿名認証 ID/ 古いを提示 ID 要求機能新規 / 更新 を発行 ( 7 ) ID セッション 提示収集サーバ各情報要求セッション情報 Anchor Verify 種セセンサー情報セッションプローブデータンの検出情報送信プローブデータ送信サ ー暗号化 ( 8 ) Send Anchor 6 Fig. 6 Functional Composition of Vehicle (ID ) ID 車両 4 S S Data Data 2 3 S の認証 プローブデータ送信プローブデータ送信 セッション情報の配布 5 の更新制御 収集サーバ プローブデータ蓄積 プローブデータベース c 2009 Information Processing Society of Japan

7 7 車両 ネゴシエーション ネゴシエーション 匿名認証管理サーバ 設定情報 ID 情報送信 認証機能 本人確認 車両 ID DB Fig. 7 新規 発行 古い 提示 更新 発行 新規発行 更新 照会と更新登録 新規 登録 更新 DB 発行 DB 更新停止処理 更新停止 更新停止要求 プローブデータ収集サーバ 7 Functional Composition of Anonymous Credential Server Refreshable scheme(sensu) 6.4 ID (AES) ( ) Refresh SSL on TCP/IPv6 8 UDP on IPv Refreshable scheme SENSU 11) ( 1 ) 2 Fig. 8 8 Functional Composition of Probe InformationServer 2 Table 2 System Implementation ( ) ID/Password 9 7 c 2009 Information Processing Society of Japan

8 3 Table 3 Software Library List MySQL 5.0 MySQL 5.0 SSL AES MIRACLE OpenSSL FIPS YaSSL SENSU 1.0 Build 831 車両シミュレータ 匿名認証管理サーバ 収集サーバ 初期化初期化初期化 共通 I/F リクエスト 共通 I/F レスポンス 共通 I/F リクエスト 共通 I/F レスポンス 発行リクエスト 発行レスポンス セッション情報発行リクエスト PC ( ) PC LAN(1000BASE-TX) 10 繰り返し実行する セッション情報発行レスポンスプローブ情報送信 プローブ情報送信 プローブ情報送信 セッションの 有効期間 CPU:1GHz Memory:1GB OS:Windows XP Pro 車両シミュレータ SW 匿名認証管理サーバ CPU:Intel Core 2 Quad 2.40GHz Memory:2.0 GB OS:Windows XP Pro 更新リクエスト 更新レスポンス. プローブデータ収集サーバ CPU:Intel Core 2 Quad 2.40GHz Memory:2.0 GB OS:Windows XP Pro 9 Fig. 9 Sequence of Processes ( 2 ) ( 3 ) 8.2 ( 4 ) ( 5 ) Fig. 10 X 10 台 10 Experiment Environment 11 ID 8 c 2009 Information Processing Society of Japan

9 11 4 Fig. 11 Situation of Operation 4 Table 4 Benchmark of Anonymous Credential Server CPU GenuineIntel Intel(R) Core(TM)2 Quad CPU Q6600(2.4GHz) 2.0GB 5285 MIPS(Dhrystone ) 2369MIPS(Whetstone ) Table 5 Measurement Result of Anonymous Authentication Linkability ( ) ( ) ( ) present, refresh ( ) ) ) AES Linkability 5000 Linkability Linkability 210 CPU 9 9 c 2009 Information Processing Society of Japan

10 Linkability core M/M/4 1 1/ ( ) / Linkability 217 Linkability 12 Linkability ID ) 秒リ ( ミ ( 秒 ) 12 Linkability Fig. 12 correlation of interval time and refresh time 1 Linkability G-BOOK CAR-WINGS 300 (5 ) 300 Linkability Linkability m km m km, km Linkability ( ) c 2009 Information Processing Society of Japan

11 9. WIDE Linkability Refreshable scheme 1) Huber W., Ladke M., R. Ogger, Extended floating car data for acquisition of traffic information, Proc of the 6th World Congress on ITS, Toronto, Canada. Linkability ) K.Uehara, H.Sunahara, J.Murai, Problems and Tentative Solutions in Internet CAR Testing with IPv6, Proc. of SAINT2003 IPv6 Workshop, Jan ) T.Ernst, K.Uehara, K.Mitsuya, Network Mobility from the InternetCAR Perspective, Proc. of AINA2003, Mar ) U. Keisuke, S. Hideki, M. Jun, The InternetCAR network architecture: Connect Linkability vehicles to the internet using IPv6 ITST2005, June2005, pp ) Masaaki Sato, Michiko Izumi, Hideki Sunahara, Keisuke Uehara, Jun Murai, Threat analysis and protection methods of personal information in vehicle probing system, The Third International Conference on Wireless and Mobile Communications(ICWMC), March ) S. Farrell, R. Housley, An Internet Attribute Certificate Profile for Authorization, RFC 3281, April ) Rie SHIGETOMI, Akira OTSUKA, Takahide OGAWA, Hideki IMAI, Anonymous Refreshability of Tokens, 25, 1,p.43-46, Dec ) Rie SHIGETOMI, Haruhiro YOSHIMOTO, Hideki IMAI, A System of Anonymous Tokens for Two Dimensional Pattern, Joho Shori Gakkai Shinpojiumu Ron- bunshu VOL.2004, NO.11(CD-ROM), PAGE.10B-2, ) Rie SHIGETOMI, Akira OTSUKA, Jun FURUKAWA, Keith MARTIN, Hideki IMAI, A Provably Secure Refreshable Partially Anonymous Token and Its Applications, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2006 E89-A(5), , ),, KeithMartin,, linkability Refreshable Tokens,, Vol.104, No. 200 pp , ) Sensu Project Home PAGE(2008/03/31 ), 11 c 2009 Information Processing Society of Japan

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