Secure routing based on node trust value in wireless sensor networks

A hierarchical routing algorithm based on node trust value is put forward to enhance routing security during data transmission in wireless sensor networks. Various trust factors are defined in accordance with node behaviors, and the synthesized trust value is obtained through calculating the weighted average of all kinds of direct and indirect trust values. At the same time, the trust value is combined with the density and the distance between nodes to select the backbone nodes of the network. Finally, the local trust value is employed to exclude malicious nodes and establish a reliable hierarchical route. Experiment and simulation results show that the proposed algorithm can effectively evaluate the node trust value and prevent low trust nodes from transferring data packets. Furthermore, the security problem of hierarchical route caused by node failure or capture is solved.