Secure Two-Way Communication via a Wireless Powered Untrusted Relay and Friendly Jammer

Abstract

In this paper, we propose a self-dependent two-way secure communication where two sources exchange confidential messages via a wireless powered untrusted amplify-and-forward (AF) relay and friendly jammer (FJ). By adopting the time switching (TS) architecture at the relay, the data transmission is accomplished in three phases: Phase I) Energy harvesting by the untrusted relay and the FJ through non-information transmissions from the sources, Phase II) Information transmission by the sources and jamming transmissions from the FJ to reduce information leakage to the untrusted relay; and Phase III) Forwarding the scaled version of the received signal from the untrusted relay to the sources. For the proposed system, we derive a new closed-form lower bound expression for the ergodic secrecy sum rate (ESSR). Numerical examples are provided to demonstrate the impacts of different system parameters such as energy harvesting time, transmit signal-to-noise ratio (SNR) and the relay/FJ location on the secrecy performance. The numerical results illustrate that the proposed network with friendly jamming (WFJ) outperforms traditional one-way communication and the two-way without friendly jamming (WoFJ) policy.

On the Performance of Low-Altitude UAV-Enabled Secure AF Relaying With Cooperative Jamming and SWIPT

“…Besides, the network transmission rate R t =0.5 bits/s/Hz, the secrecy rate R s =0.2 bits/s/Hz are adopted. Further, we assume N 0 = 10 −2 , ζ = 2, energy harvesting efficiency factor ε = 0.7, ω 1 = 0.28, ω 2 = 9.61, κ m = 1, and κ M = 10 [21], [23], [28]. Also, the EPSA represents equal power allocation (i.e., λ = 0.5) and equal power splitting ratio (i.e., β = 0.5).…”

Intelligent Trajectory Design for Secure Full- Duplex MIMO-UAV Relaying Against Active Eavesdroppers: A Model-Free Reinforcement Learning Approach

“…Further, in [33] the trajectory design and resource allocation of a similar system model has been explored to minimize outage probability. For security-based FD-operated UAV communications, in [34], the authors have considered an FD system with an untrusted UR, and then studied secrecy outage and average secrecy rate performance metrics, wherein the untrusted relaying refers to the case when the intermediate relaying conducts adversarial activity during communication facilitation [35]- [37]. It should be worth pointing out that FD malicious nodes can potentially pose severe security attacks compared to their passive counterparts.…”

“…where the Q-function Q π (s, a) indicates the expected return starting from the state s, taking the action a and following policy π thereafter, in which Υ t is defined in (35). Likewise, the value function of a state s under a policy π is defined as the expected return when starting in state s and then following policy π afterwards, which can be given by…”

Security and reliability performance analysis for two‐way wireless energy harvesting based untrusted relaying with cooperative jamming

“…The key idea behind SWIPT is that a wireless node can capture radio‐frequency (RF) signals sent by a source node and then transform them into direct current to charge the node's rechargeable battery to the extent that it further can make use of it for signal processing or information transmission (IT) [14]. In recent years, great efforts have been dedicated to the study of SWIPT for non‐security‐based [15, 16] and security‐based systems [17–26]. Nasir et al .…”

“…Finally, Tatar Mamaghani et al . [25, 26] proposed a secure two‐way energy harvesting (EH)‐based relaying communication in the presence of different types of external jammers and analysed the ergodic secrecy sum rate performance in the high signal‐to‐noise ratio (SNR) regime.…”