Bluetooth RePairing Attack

1
Bluetooth Re-Pairing AttackSybil Attack

• Tim McClean
• TDC 477
• 10/24/2006

2
Bluetooth

• 79 Channels
• 2.45 GHz
• Up to 1600 channel changes
• per second

3
Re-Pairing Attack

• Encrypted Stream of data using pairing PIN
  numbers
• 128-bit key

Paired
Re-Pair
PIN
4
Re-Pairing Attack Prevention

• Do not re-pair your device in a public place
• Know what devices you are pairing
• Do not automatically pair with other devices

5
Sybil Networks

• Networks of wireless devices that record
  information about the area around them
• Tend to use geographic information to identify
  their location

6
Sybil Attack

• Make one of the sensor nodes to appear in
  multiple places at once.

C
A
B
7
Sybil Attack Prevention

• Encrypt traffic between nodes
• Only communicate with known nodes and not add
  nodes by discovery