Adaptability Against Eavesdropping Attack in WSN: Co-Operative Beamforming and Relays Approach

Abstract

Security is the major concern in wireless sensor networks. To reduce security threats in WSNs physical layer, each node could be designed with an antenna which forms a MIMO communication system. This research work proposed a novel and effective solution to enhance the security of WSN. The sensor node at the transmitter side are used to transmit the beamforming signal to the receiver while few nodes are used to create artificial noise to jam the eavesdropper. Beamforming is used in WSNs for effective communication which enhances the received signal to noise ratio (SNR) at the receiver side. Based on beamforming, smart antennas are modified to switch the direction and adjusts the transmitted power and phase through intermediate relay nodes and constructively it is used in the destination side to combine the signal. This new beamforming technique needs the information about the channel for security concern in these relay system of destination as well as an eavesdropper. For physical layer security beamforming area along with schemes such as amplify and forward relays, decode and forward relays and also co-operative jamming relays where adopted, to confuse the eavesdropper. Two channels are used in the experimental model such as main/legitimate channel, which is used between the relay node and destination node, and the other one is the wiretap channel which is used between the intermediate relay node and the eavesdropper.