340 research outputs found
Principles of Physical Layer Security in Multiuser Wireless Networks: A Survey
This paper provides a comprehensive review of the domain of physical layer
security in multiuser wireless networks. The essential premise of
physical-layer security is to enable the exchange of confidential messages over
a wireless medium in the presence of unauthorized eavesdroppers without relying
on higher-layer encryption. This can be achieved primarily in two ways: without
the need for a secret key by intelligently designing transmit coding
strategies, or by exploiting the wireless communication medium to develop
secret keys over public channels. The survey begins with an overview of the
foundations dating back to the pioneering work of Shannon and Wyner on
information-theoretic security. We then describe the evolution of secure
transmission strategies from point-to-point channels to multiple-antenna
systems, followed by generalizations to multiuser broadcast, multiple-access,
interference, and relay networks. Secret-key generation and establishment
protocols based on physical layer mechanisms are subsequently covered.
Approaches for secrecy based on channel coding design are then examined, along
with a description of inter-disciplinary approaches based on game theory and
stochastic geometry. The associated problem of physical-layer message
authentication is also introduced briefly. The survey concludes with
observations on potential research directions in this area.Comment: 23 pages, 10 figures, 303 refs. arXiv admin note: text overlap with
arXiv:1303.1609 by other authors. IEEE Communications Surveys and Tutorials,
201
Secure Beamforming for MIMO Two-Way Communications with an Untrusted Relay
This paper studies the secure beamforming design in a multiple-antenna
three-node system where two source nodes exchange messages with the help of an
untrusted relay node. The relay acts as both an essential signal forwarder and
a potential eavesdropper. Both two-phase and three-phase two-way relay
strategies are considered. Our goal is to jointly optimize the source and relay
beamformers for maximizing the secrecy sum rate of the two-way communications.
We first derive the optimal relay beamformer structures. Then, iterative
algorithms are proposed to find source and relay beamformers jointly based on
alternating optimization. Furthermore, we conduct asymptotic analysis on the
maximum secrecy sum-rate. Our analysis shows that when all transmit powers
approach infinity, the two-phase two-way relay scheme achieves the maximum
secrecy sum rate if the source beamformers are designed such that the received
signals at the relay align in the same direction. This reveals an important
advantage of signal alignment technique in against eavesdropping. It is also
shown that if the source powers approach zero the three-phase scheme performs
the best while the two-phase scheme is even worse than direct transmission.
Simulation results have verified the efficiency of the secure beamforming
algorithms as well as the analytical findings.Comment: 10 figures, Submitted to IEEE Transactions on Signal Processin
Secure Multiple Amplify-and-Forward Relaying Over Correlated Fading Channels
This paper quantifies the impact of correlated fading
on secure communication of multiple amplify-and-forward (AF)
relaying networks. In such a network, the base station (BS) is
equipped with multiple antennas and communicates with the
destination through multiple AF relays, while the message from
the relays can be overheard by an eavesdropper. We focus
on the practical communication scenario, where the main and
eavesdropper’s channels are correlated. In order to enhance
the transmission security, transmit antenna selection (TAS) is
performed at the BS, and the best relay is chosen according to the
full or partial relay selection criterion, which relies on the dualhop
relay channels or the second-hop relay channels, respectively.
For these criteria, we study the impact of correlated fading
on the network secrecy performance, by deriving an analytical
approximation for the secrecy outage probability (SOP) and an
asymptotic expression for the high main-to-eavesdropper ratio
(MER). From these results, it is concluded that the channel
correlation is always beneficial to the secrecy performance of full
relay selection. However, it deteriorates the secrecy performance
if partial relay selection is used, when the number of antennas
at the BS is less than the number of relays.ARC Discovery Projects Grant DP150103905
A cooperative jamming technique to protect a two-user broadcast channel with confidential messages and an external eavesdropper
This work addresses the security of a two-user broadcast channel. The challenge of protecting a
broadcast channel is associated with the necessity of securing the system, not only against eavesdropping
attacks originating from external nodes, but also to ensure that the inside users do not eavesdrop on each
other’s information. To address this issue, the present work proposes a cooperative jamming scheme
that provides protection against eavesdropping attacks carried out simultaneously by inside users and
external eavesdroppers. To achieve this goal, the developed scheme combines real interference alignment
with a blind cooperative jamming technique defined in the literature. An information theoretical
analysis shows that positive secure degrees of freedom are achievable using the proposed solution.publishe
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