A double-layer isolation mechanism for malicious nodes in wireless sensor networks

Isolation plays an important role in the security of wireless sensor networks. Existing isolation models for wireless sensor networks possess excessive energy consumption. We propose a double-layer isolation mechanism based on an improved Dijkstra algorithm. The number of “optimal” nodes is obtained based on the calculation formula. Two groups of “optimal” nodes are determined by the arrival time difference ranging algorithm and the improved Dijkstra algorithm. The first layer isolation and the second layer isolation are constructed by the obtained two groups of “optimal” nodes, respectively. According to the status of receiving and sending data, the “optimal” routing protocol and working mode are selected. Based on the cooperation between two layers of isolation, intruded nodes are isolated from a wireless sensor network. The intrusion source is detected by monitoring the intruded nodes. Simulation results show that the proposed isolation mechanism can effectively reduce the energy consumption of wireless sensor nodes. High transmission efficiency, rapid response, and enhanced security are provided for wireless sensor networks.