security and cooperation in ad hoc networks gaia maselli iit - cnr [email protected]
TRANSCRIPT
Security and Cooperation in Security and Cooperation in Ad Hoc NetworksAd Hoc Networks
Gaia MaselliIIT - [email protected]
The availability problemThe availability problem
Problem: how to avoid that some nodes misbehave
to find out a mechanism to detect and isolate misbehaving nodes
Cooperation misbehavior• Malicious misbehavior: intentional DoS attack• Selfishness: no routing/forwarding to save resources
Current approachesCurrent approaches
Watchdog + Reputation system Watchdog weaknesses: a node might not detect a
misbehaving node in presence of
– collisions
– no homogeneous transmission ranges Drawbacks of cooperation in security mechanisms
– overhead (additional traffic)
– wrong accusations spreading
A different approach?A different approach?
New challenges– Detection of misbehaving nodes without watchdog
– No spreading of false information
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