Secrecy outage probability with destination assisted jamming in presence of an untrusted relay

The study of secrecy capacity of wireless networks, considering variety of powerful attacks is currently of great interest. In this paper, we have considered a possible attack scenario where an eavesdropper is present as a legitimate relay node in disguise in the network. A novel scheme of simultaneous transmission of jamming signal and message signal is proposed to confuse the eavesdropper. Here we consider a source, a destination and two amplify and forward (AF) relays each employed with a single antenna. One of the two relays used in the network is un-trusted and eavesdrop the information signal sent by the source. We analyze secrecy outage probability (SOP) of our proposed scheme under several network parameters such as target secrecy rate, transmit power of source, jamming power by destination and mean powers of fading channel. We also develop a simulation test bed to evaluate secrecy outage probability.