116 research outputs found
Relay Selection for Wireless Communications Against Eavesdropping: A Security-Reliability Tradeoff Perspective
This article examines the secrecy coding aided wireless communications from a
source to a destination in the presence of an eavesdropper from a
security-reliability tradeoff (SRT) perspective. Explicitly, the security is
quantified in terms of the intercept probability experienced at the
eavesdropper, while the outage probability encountered at the destination is
used to measure the transmission reliability. We characterize the SRT of
conventional direct transmission from the source to the destination and show
that if the outage probability is increased, the intercept probability
decreases, and vice versa. We first demonstrate that the employment of relay
nodes for assisting the source-destination transmissions is capable of
defending against eavesdropping, followed by quantifying the benefits of
single-relay selection (SRS) as well as of multi-relay selection (MRS) schemes.
More specifically, in the SRS scheme, only the single "best" relay is selected
for forwarding the source signal to the destination, whereas the MRS scheme
allows multiple relays to participate in this process. It is illustrated that
both the SRS and MRS schemes achieve a better SRT than the conventional direct
transmission, especially upon increasing the number of relays. Numerical
results also show that as expected, the MRS outperforms the SRS in terms of its
SRT. Additionally, we present some open challenges and future directions for
the wireless relay aided physical-layer security.Comment: 16 pages, IEEE Network, 201
Optimal Relay Selection for Physical-Layer Security in Cooperative Wireless Networks
In this paper, we explore the physical-layer security in cooperative wireless
networks with multiple relays where both amplify-and-forward (AF) and
decode-and-forward (DF) protocols are considered. We propose the AF and DF
based optimal relay selection (i.e., AFbORS and DFbORS) schemes to improve the
wireless security against eavesdropping attack. For the purpose of comparison,
we examine the traditional AFbORS and DFbORS schemes, denoted by T-AFbORS and
TDFbORS, respectively. We also investigate a so-called multiple relay combining
(MRC) framework and present the traditional AF and DF based MRC schemes, called
T-AFbMRC and TDFbMRC, where multiple relays participate in forwarding the
source signal to destination which then combines its received signals from the
multiple relays. We derive closed-form intercept probability expressions of the
proposed AFbORS and DFbORS (i.e., P-AFbORS and P-DFbORS) as well as the
T-AFbORS, TDFbORS, T-AFbMRC and T-DFbMRC schemes in the presence of
eavesdropping attack. We further conduct an asymptotic intercept probability
analysis to evaluate the diversity order performance of relay selection schemes
and show that no matter which relaying protocol is considered (i.e., AF and
DF), the traditional and proposed optimal relay selection approaches both
achieve the diversity order M where M represents the number of relays. In
addition, numerical results show that for both AF and DF protocols, the
intercept probability performance of proposed optimal relay selection is
strictly better than that of the traditional relay selection and multiple relay
combining methods.Comment: 13 page
A Survey on Wireless Security: Technical Challenges, Recent Advances and Future Trends
This paper examines the security vulnerabilities and threats imposed by the
inherent open nature of wireless communications and to devise efficient defense
mechanisms for improving the wireless network security. We first summarize the
security requirements of wireless networks, including their authenticity,
confidentiality, integrity and availability issues. Next, a comprehensive
overview of security attacks encountered in wireless networks is presented in
view of the network protocol architecture, where the potential security threats
are discussed at each protocol layer. We also provide a survey of the existing
security protocols and algorithms that are adopted in the existing wireless
network standards, such as the Bluetooth, Wi-Fi, WiMAX, and the long-term
evolution (LTE) systems. Then, we discuss the state-of-the-art in
physical-layer security, which is an emerging technique of securing the open
communications environment against eavesdropping attacks at the physical layer.
We also introduce the family of various jamming attacks and their
counter-measures, including the constant jammer, intermittent jammer, reactive
jammer, adaptive jammer and intelligent jammer. Additionally, we discuss the
integration of physical-layer security into existing authentication and
cryptography mechanisms for further securing wireless networks. Finally, some
technical challenges which remain unresolved at the time of writing are
summarized and the future trends in wireless security are discussed.Comment: 36 pages. Accepted to Appear in Proceedings of the IEEE, 201
Security versus Reliability Analysis of Opportunistic Relaying
Physical-layer security is emerging as a promising paradigm of securing
wireless communications against eavesdropping between legitimate users, when
the main link spanning from source to destination has better propagation
conditions than the wiretap link from source to eavesdropper. In this paper, we
identify and analyze the tradeoffs between the security and reliability of
wireless communications in the presence of eavesdropping attacks. Typically,
the reliability of the main link can be improved by increasing the source's
transmit power (or decreasing its date rate) to reduce the outage probability,
which unfortunately increases the risk that an eavesdropper succeeds in
intercepting the source message through the wiretap link, since the outage
probability of the wiretap link also decreases when a higher transmit power (or
lower date rate) is used. We characterize the security-reliability tradeoffs
(SRT) of conventional direct transmission from source to destination in the
presence of an eavesdropper, where the security and reliability are quantified
in terms of the intercept probability by an eavesdropper and the outage
probability experienced at the destination, respectively. In order to improve
the SRT, we then propose opportunistic relay selection (ORS) and quantify the
attainable SRT improvement upon increasing the number of relays. It is shown
that given the maximum tolerable intercept probability, the outage probability
of our ORS scheme approaches zero for , where is the number
of relays. Conversely, given the maximum tolerable outage probability, the
intercept probability of our ORS scheme tends to zero for .Comment: 9 pages. IEEE Transactions on Vehicular Technology, 201
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
Security for 5G Mobile Wireless Networks
The advanced features of 5G mobile wireless network systems yield new security requirements and challenges. This paper presents a comprehensive survey on security of 5G wireless network systems compared to the traditional cellular networks. The paper starts with a review on 5G wireless networks particularities as well as on the new requirements and motivations of 5G wireless security. The potential attacks and security services with the consideration of new service requirements and new use cases in 5G wireless networks are then summarized. The recent development and the existing schemes for the 5G wireless security are presented based on the corresponding security services including authentication, availability, data confidentiality, key management and privacy. The paper further discusses the new security features involving different technologies applied to 5G such as heterogeneous networks, device-to-device communications, massive multiple-input multiple-output, software defined networks and Internet of Things. Motivated by these security research and development activities, we propose a new 5G wireless security architecture, based on which the analysis of identity management and flexible authentication is provided. As a case study, we explore a handover procedure as well as a signaling load scheme to show the advantage of the proposed security architecture. The challenges and future directions of 5G wireless security are finally summarized
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