Secure Cooperative Transmission Against Jamming-Aided Eavesdropper for ARQ Based Wireless Networks

Secure the cooperative transmission is studied for an automatic repeat request (ARQ)-based wireless network against a jamming-aided eavesdropper. The eavesdropper utilizes the jamming attack to assist its eavesdropping by forcing the legitimate transmitter to retransmit its confidential messages under poor wiretap channel quality. Then, utilizing these retransmission opportunities, the eavesdropper will eavesdrop the confidential message under good wiretap channel quality. To address the threat from the jamming-aided eavesdropper in the ARQ-based wireless network, we propose an adaptive cooperative relaying and jamming secure transmission scheme to protect the confidential messages. In the proposed scheme, the legitimate receiver adopts the energy detection method to detect the jamming-aided eavesdropper's action and a cooperative node will aid the secure transmission through cooperative relaying under jamming attack or cooperative jamming under eavesdropping attack. By taking into account of the detection errors, we investigate the transmission outage probability and the secrecy outage probability, and derive their closed-form expressions for both one retransmission and multiple retransmissions scenarios. Numerical results are presented to verify the derived analytical results and demonstrate the performance superiority of the proposed scheme in terms of the secrecy outage probability.