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Bluetooth 技術篇

Bluetooth 技術篇. 藍芽技術如何傳輸資料 藍芽傳輸的安全性. 第六組 吳哲榮. 如何傳輸資料. 1. 信號與系統 類比調變與數位調變 2. 設備位置 (Device Addressing) 3. 實體通道 (Physical channel) 4. 跳頻 (Frequency Hopping) 5. 時序同步 (Master and Slave) 6.Piconet and Scatternet 7. 資料傳輸形態 (SCO and ACL). 類比調變 or 數位調變 ?!. ANS ：　數位調變

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Bluetooth 技術篇

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  1. Bluetooth 技術篇 • 藍芽技術如何傳輸資料 • 藍芽傳輸的安全性 第六組 吳哲榮

  2. 如何傳輸資料 1.信號與系統 類比調變與數位調變 2.設備位置(Device Addressing) 3.實體通道(Physical channel) 4.跳頻(Frequency Hopping) 5.時序同步(Master and Slave) 6.Piconet and Scatternet 7.資料傳輸形態(SCO and ACL)

  3. 類比調變or數位調變?! ANS：　數位調變 (Digital Modulation)

  4. Why? 1.抗干擾能力佳 - 訊號只有0與1 2.資料傳輸統合 - Data、Voice、Video 3.數位編碼加密 - Encryption

  5. Device Addressing 1.BD_ADDR NAP(not important)+UAP(hopping)+LAP(unique) 2.AM_ADDR Active Member Address MAX：8 3.PM_ADDR Parked Member Address MAX：256 4.AR_ADDR required Parked Mode – to – Active Mode

  6. 實體通道(Physical channel) • 1Mbit/sec

  7. 實體通道(頻寬共享)

  8. 跳頻技術(Frequency Hopping)

  9. Master和Slave時序同步 • 確認Master與Slave有相同的time block • 以Master的時序為準

  10. Master Active Slave Parked Slave Standby Piconet Formation • Page - scan protocol • to establish links with nodes in proximity

  11. Scatternet Formation

  12. Physical Link Types • Synchronous Connection Oriented (SCO) Link • Slot reservation at fixed intervals • Asynchronous Connection-less (ACL) Link • Polling access method

  13. 藍芽的安全性(Security) • 無線傳輸的潛在威脅 • 無線傳輸的安全加密

  14. 潛在的危險

  15. 藍芽的加密技術 1.Initialization key 2.Link key 3.Mutual authentication 4.Encryption key 5.Key stream 6.Encryption of data

  16. Initialization key IN_RAND IN_RAND IN_RAND PIN PIN E22 E22 L L Kinit Kinit

  17. Link key (1) Kinit Kinit K KA=Klink KA=Klink

  18. Link key (2) LK_RANDA LK_RANDB ADDRA ADDRB LK_RANDA LK_RANDB E21 E21 LKA LKB KAB =Klink KAB =Klink LKB LKA LK_RANDB LK_RANDB E21 E21 ADDRB ADDRA

  19. Mutual authentication ADDRB AU_RAND ADDRB ADDRB E1 E1 Klink Klink AU_RAND AU_RAND SRES ACO SRES ACO SRES

  20. Encryption key EN_RAND EN_RAND EN_RAND E3 E3 Klink Klink ACO ACO KC KC

  21. Key stream ADDRA ADDRA E0 E0 clockMASTER clockMASTER KC KC KCIPHER KCIPHER

  22. Encryption of data KCIPHER KCIPHER DATA DATA KCIPHER KCIPHER DATA DATA

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