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Wireless ad hoc networks have great potentials in a broad range of applications. Their inherent vulnerability to various network attacks however limits their wide adaptation and deployment in practice. In this paper, the authors address one of the most dangerous attacks, packet drop attack, in wireless ad hoc networks by post-routing detection. They introduce a simple, effective detection technique Side Channel Monitoring (SCM). The idea is to use nodes adjacent to a data communication route to monitor the message forwarding behavior of the nodes en route. These monitoring nodes constitute a directional side channel toward the source, in parallel to the backward route (primary channel). On observing misbehavior, they issue alarm packets to the source node through both channels.
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