Nodes in mobile ad hoc networks do not rely on a central infrastructure but relay packets originated by other nodes. Mobile ad hoc networks can work properly only if the participating nodes collaborate in routing and forwarding. For individual nodes it might be advantageous not to collaborate, though. The new routing protocol extensions presented in this paper make it possible to detect and isolate misbehaving nodes, thus making it unattractive to deny collaboration. In the presented scheme, trust relationships and routing decisions are made based on experienced, observed, or reported routing and forwarding behavior of other nodes. A hybrid scheme of selective altruism and utilitarism is presented to strengthen mobile ad hoc network protocols in their resistance to security attacks, while aiming at keeping network throughput high. This paper focuses particularly on the network layer, using the Dynamic Source Routing (DSR) protocol as an example.
By: Sonja Buchegger and Jean-Yves Le Boudec
Published in: RZ3354 in 2001
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