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Little effort has been made to compare routing protocols according to their resiliency in wireless multi-hop sensor networks in the presence of packet dropping malicious insiders. In this paper, we propose a new taxonomy of routing protocols obtained by applying our resiliency metric. Several resiliency enhancing methods such as introducing a random behavior to the classical routing protocols and a new data replication method based on the distance information have been evaluated as well. Simulation results demonstrate the effectiveness of the proposed approach.