Secure Broadcasting Over Fading Channels

Khisti, Ashish; Tchamkerten, Aslan; Wornell, Gregory W.

doi:10.1109/tit.2008.921861

Cited by 248 publications

(261 citation statements)

References 26 publications

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“…On the contrary, (29) of this paper may have infinite solutions for p Y |Z (y|z) but we prove that none of them is a valid solution because (29) does not hold good as z c → ∞; 2) To disprove 3) in [19,Section IV], the authors establish the impossibility of γ = 0 by proposing a family of distributions with strictly monotonically increasing mutual information, whereas to disprove (49), we exploit the fact that the capacity is non-negative; 3) In [19], the authors establish that the mutual information is strictly concave in F . Our result on concavity relies on [23] which does not establish strict concavity. Consequently we do not pursue the problem of establishing uniqueness of the input distribution in this work.…”

Section: ) Its Support Contains An Interval;mentioning

confidence: 84%

Noncoherent Capacity of Secret-Key Agreement With Public Discussion

Agrawal

Rezki

Khisti

et al. 2011

IEEE Trans.Inform.Forensic Secur.

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Abstract-We study the non-coherent capacity of secret-key agreement with public discussion over i.i.d. Rayleigh Fading wireless channels, where neither the sender nor the receivers have access to instantaneous channel state information (CSI). We present two results. At high Signal-to-Noise Ratio (SNR), the secret-key capacity is bounded in SNR, regardless of the number of antennas at each terminal. Second, for a system with a single antenna at both the legitimate and the eavesdropper terminals and an arbitrary number of transmit antennas, the secret-key capacity-achieving input distribution is discrete, with a finite number of mass points. Numerically we observe that at low-SNR, the capacity achieving distribution has two mass points with one of them at the origin.Index Terms-Non-coherent capacity, secret-key agreement, Rayleigh fading channels, information theoretic security, KarushKuhn-Tucker (KKT) condition, discrete input distribution.

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Section: ) Its Support Contains An Interval;mentioning

confidence: 84%

Noncoherent Capacity of Secret-Key Agreement With Public Discussion

Agrawal

Rezki

Khisti

et al. 2011

IEEE Trans.Inform.Forensic Secur.

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“…In [23], the secrecy rate over MU-MIMO broadcasting channels was well studied. In [24], a robust beamforming scheme for MU-MIMO downlink networks was proposed by using a Bayesian approach.…”

Section: A Related Workmentioning

confidence: 99%

“…From (23), it is known that ε is a monotonously increasing function of M−1 M and R. Given a requirement on the outage probability ε, the sum secrecy outage capacity R is maximized by minimizing …”

Section: Appendix B Proof Of Theoremmentioning

confidence: 99%

Mode Selection in MU-MIMO Downlink Networks: A Physical-Layer Security Perspective

Chen

2017

IEEE Systems Journal

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Abstract-In this paper, we consider a homogenous multiantenna downlink network where a passive eavesdropper intends to intercept the communication between a base station (BS) and multiple secure users (SU) over Rayleigh fading channels. In order to guarantee the security of information transfer, physical layer security is employed accordingly. For such a multiple user (MU) secure network, the number of accessing SUs, namely transmission mode, has a great impact on the secrecy performance. Specifically, on the one hand, a large number of accessing SUs will arise high inter-user interference at SUs, resulting in a reduction of the capacity of the legitimate channel. On the other hand, high inter-user interference will interfere with the eavesdropper and thus degrades the performance of the eavesdropper channel. Generally speaking, the harmful interuser interference may be transformed as a useful tool of antieavesdropping. The focus of this paper is on selecting the optimal transmission mode according to channel conditions and system parameters, so as to maximize the sum secrecy outage capacity. Moreover, through asymptotic analysis, we present several simple mode selection schemes in some extreme cases. Finally, simulation results validate the effectiveness of the proposed mode selection schemes in MU secure communications.Index Terms-Physical layer security, secrecy outage capacity, mode selection, asymptotic analysis.

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“…For the broadcast multi-users scenario, Csiszár and Körner extended the original wiretap channel, proposed by Wyner, to the case where the source sends common information to both the destination and the eavesdropper while the confidential messages are sent only to the destination. The secrecy capacity of this scenario, for the case of a broadcast wiretap channel with parallel and fading channels assuming perfect main CSI at the transmitter, was considered in [20]. For the multiple access scenario, the authors in [21] investigated the secrecy capacity of a degraded channel where the eavesdropper obtains a degraded version of the receiver's signal.…”

Section: Introductionmentioning

confidence: 99%