Security of Relay Wiretap Networks with Energy Harvesting

In this paper, we investigate the security of relay wiretap networks for internet of things (IoT), in which a transmitter sends the information to the receiver with the help of the energy limited relays. Specifically, the optimal relay selection based on two energy harvesting (EH) schemes, i.e., power splitting relay protocol (PSR) and time switching relay protocol (TSR), are introduced to improve the secrecy performance of the considered system. On this basis, the exact closed-form secrecy outage probability (SOP) expressions of the system with two EH protocols are derived, respectively. Further, for more deep insights, the asymptotic SOP expressions are also achieved with infinity number of relays. From the results, we can conclude that the PSR protocol is better than TSR in terms of improving the secrecy performance of relay wiretap networks.