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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
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

slide2
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)

slide3

類比調變or數位調變?!

ANS: 數位調變

(Digital Modulation)

slide4
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

device addressing
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

master slave
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
piconet formation

Master

Active Slave

Parked Slave

Standby

Piconet Formation
  • Page - scan protocol
    • to establish links with nodes in proximity
physical link types
Physical Link Types
  • Synchronous Connection Oriented (SCO) Link
    • Slot reservation at fixed intervals
  • Asynchronous Connection-less (ACL) Link
    • Polling access method
security
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
slide15
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

i nitialization key
Initialization key

IN_RAND

IN_RAND

IN_RAND

PIN

PIN

E22

E22

L

L

Kinit

Kinit

l ink key 1
Link key (1)

Kinit

Kinit

K

KA=Klink

KA=Klink

l ink key 2
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

mutual authentication
Mutual authentication

ADDRB

AU_RAND

ADDRB

ADDRB

E1

E1

Klink

Klink

AU_RAND

AU_RAND

SRES

ACO

SRES

ACO

SRES

e ncryption key
Encryption key

EN_RAND

EN_RAND

EN_RAND

E3

E3

Klink

Klink

ACO

ACO

KC

KC

k ey stream
Key stream

ADDRA

ADDRA

E0

E0

clockMASTER

clockMASTER

KC

KC

KCIPHER

KCIPHER

encryption of data
Encryption of data

KCIPHER

KCIPHER

DATA

DATA

KCIPHER

KCIPHER

DATA

DATA