Results 131 to 140 of about 104,496 (164)

AN-Aided Relay-Selection Scheme for Securing Untrusted RF-EH Relay Systems

IEEE Transactions on Green Communications and Networking, 2017
Energy harvesting (EH) technology has imposed new constraints on the amount of time an energy-constrained relay node needs to use for EH and information forwarding. Moreover, EH techniques may increase vulnerability to eavesdropping, since a power receiver, as a potential eavesdropper, usually has a shorter access distance than an information receiver.
Naofal Al-Dhahir, Kamel Tourki, Ahmed El Shafie   +2 more
exaly   +3 more sources

Physical-Layer Secret Key Generation With Colluding Untrusted Relays

IEEE Transactions on Wireless Communications, 2016
In this paper, we propose a physical-layer secret key generation scheme for multiantenna legitimate nodes with the help of multiple untrusted relays, equipped with multiple antennas. The untrusted relays conform to the relaying transmission protocol of legitimate nodes, but they also eavesdrop the confidential information of an legitimate transmitter ...
Chan Dai Truyen Thai, Tony Q. S. Quek, Jemin Lee   +2 more
exaly   +3 more sources

Secure Transmission with Optimal Power Allocation in Untrusted Relay Networks

IEEE Wireless Communications Letters, 2014
We consider the problem of secure transmission in two-hop amplify-and-forward untrusted relay networks. We analyze the ergodic secrecy capacity (ESC) and present compact expressions for the ESC in the high signal-to-noise ratio regime.
Lifeng Wang, Nghi H Tran, Trung Q. Duong
exaly   +2 more sources

The multiple access channel with an untrusted relay

2014 IEEE Information Theory Workshop (ITW 2014), 2014
This paper considers a Gaussian multiple access channel aided by a relay. Specifically, the relay facilitates communication between multiple sources and a destination to which the sources have no direct link. In this set up, the relay node is considered to be untrusted, i.e., honest but curious, from whom the source messages need to be kept secret.
Ahmed A. Zewail, Aylin Yener
openaire   +2 more sources

The role of an untrusted relay in secret communication

2008 IEEE International Symposium on Information Theory, 2008
We consider the communication scenario where a source-destination pair wishes to keep the information secret from a relay node despite wanting to enlist its help. A class of relay channels with orthogonal components is considered and an upper bound on the secrecy rate is derived.
Xiang He 0001, Aylin Yener
openaire   +2 more sources

Leaking Rate Region to Eavesdroppers and Untrusted Relays

2016 IEEE Global Communications Conference (GLOBECOM), 2016
The trustworthiness of nodes in a network is practically a complicated concept and strongly depends on the social relationship among the nodes. For a certain model of trustworthiness, the scheme can be optimized to achieve the highest average secrecy rate based on pre-defined information about possibly malicious nodes.
Chan Dai Truyen Thai, Jemin Lee, Tony Q. S. Quek   +2 more
openaire   +2 more sources

Cooperative non-orthogonal relaying for security enhancement in untrusted relay networks

2017 IEEE International Conference on Communications (ICC), 2017
Recently, there has been a surge of increased interest in using physical layer security to safeguard the fifth generation (5G) mobile networks. In this paper, we study the problem of secure communications in untrusted relay networks. A new nonorthogonal relaying protocol is proposed, aiming at maximizing the secrecy rate.
Lu Lv, Qiang Ni, Zhiguo Ding 0001, Jian Chen 0002   +3 more
openaire   +2 more sources

Secrecy Rate of Two-Hop AF Relaying Networks with an Untrusted Relay

Wireless Personal Communications, 2013
Two cooperative communication protocols, two-way and one-way half-duplex relayings, are investigated and then compared in the amplify-and-forward (AF) mode. The relay is assumed to play the roles of eavesdropper and relay (i.e., an untrusted relay). With a fair power constraint at each node, the secrecy rate of the one-way relaying protocol is proved ...
Nanrun Zhou, Xun Chen, Chisheng Li, Zhi Xue   +3 more
openaire   +1 more source

Cooperation with an untrusted relay in broadcast channels

2013 IEEE International Symposium on Information Theory, 2013
This paper studies secure communication over the broadcast channels with an untrusted relay. The relay helps users with transmission in broadcast channels, but we also wish to keep the information secret against the relay. Compress-and-forward relaying is a potential strategy to achieve secrecy.
openaire   +1 more source

Performance of Untrusted Amplify-and-Forward Relaying

2013 4th International Conference on Intelligent Systems, Modelling and Simulation, 2013
In this paper, we analyze the secrecy outage performance of amplify-and-forward (AF)-based relay networks consisting of a source, a destination, and an untrusted relay, where each terminal has a single antenna and operates in a half-duplex mode. In this network, the common message is transmitted through the relay-path, and the private message is ...
null MinChul Ju, null Do-Hoon Kim
openaire   +1 more source