28-09-2012, 01:08 PM
Denial of Service in Sensor Networks
DenialOfService.ppt (Size: 662.5 KB / Downloads: 41)
DoS in Sensor Networks
Disrupt communication and cooperation between nodes
Decrease availability of the whole network
Waste precious resources (power)
Why care about it now?
Security integrated at every layer
Have to ensure security at design time
UWSN at its initial stage
Adding security after the protocol is “stable”
UWSN constraints
Not able to secure their communication medium
Low speed of the transmission (1500 m/s)
Low data rate (5-20 kb/s)
Limited bandwidth (around 30 KHz)
High mobility (3-6 km/h)
Environment 3D vs. 2D
Physical constraints (pressure, corrosion)
DoS in Physical Layer
1) Jamming
Constantly sending noise into channel
Even if temporary, can be dangerous
Workaround: Switch to lower duty cycle
Defense:
- Spread spectrum
- Try to alert other nodes about the attack
Attacks Strongly Influencing UWSN
Homing
- We will need to have some privileged node, with greater computation power
Wormhole
- The difference in propagation delay between radio waves and sound
Conclusions
Security has to be considered at the design time of protocols on every layer
We will need to have a solution that will attempt to provide defense from multiple DoS attacks
The security vs. energy efficiency trade-off