Cooperative jamming for physical layer security in Wireless Sensor Networks

Interference is generally considered as the redundant and unwanted occurrence in wireless communication. This work proposes a novel cooperative jamming mechanism for scalable networks like Wireless Sensor Networks (WSNs) which makes use of friendly interference to confuse the eavesdropper and increase its uncertainty about the source message. The whole communication link is built with the help of Information theoretic source and channel coding mechanisms. The whole idea is to make use of normally inactive relay nodes in the selective Decode and Forward cooperative communication and make them work as cooperative jamming sources to increase the equivocation of the eavesdropper. In this work, eavesdropper´s equivocation is compared with the main channel in terms of mutual information and secrecy capacity.