Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

ETRI Journal

A Distributed Implementation Algorithm for Physical Layer Security Based on Untrusted Relay Cooperation and Artificial Noise

Xiangyu Li, Xueming Wang, Xiangyang Xu, Liang Jin

Published Jan 29, 2014• 4 citations
Publisher

Abstract

In this letter, we consider a cooperation system with multiple untrusted relays (URs). To keep the transmitted information confidential, we obtain joint channel characteristics (JCCs) through combining the channels from the source to the destination. Then, in the null space of the JCCs, jammers construct artificial noise to confuse URs when the source node broadcasts its data. Through a distributed implementation algorithm, the weight of each node can be obtained from its own channel state information. Simulation results show that high-level security of the system can be achieved when internal and external eavesdroppers coexist.

DOI
10.4218/etrij.13.0213.0090

Related papers

A physical layer security transmission mechanism based on joint channel characteristics in relay system

Xiangyu Li, Liang Jin, Kaizhi Huang

To solve the problem of untrusted relays, we propose a physical layer security transmission mechanism in relay system. We get the joint channel characteristics by combining the two channels, source node to relay and relay to destination node, into one. Based on this, we construct artificial noise and add it to the transmission signal, in order to make the internal and external wire-tappers get none of the information. The optimal signal transmission power is calculated subsequently. Simulation results show that when the artificial noise lies in the null space of the legitimate receiver's channel, secrecy capacity of the cooperative relay system can be improved and the bit-error rate of the legitimate receiver is much smaller than wire-tappers.

IEEE International Conference on Communication Technology (ICCT)•Nov 1, 2012•4 citations

Securing Untrusted Full-Duplex Relay Channels in the Presence of Multiple External Cluster-Based Eavesdroppers

Ahmed El Shafie, Asma Mabrouk, Kamel Tourki +2 more

This letter investigates the physical layer security in a wireless cooperative network where communication is assisted by a full-duplex (FD) untrusted relay in the presence of multiple external eavesdroppers. A cluster-based colluding eavesdropping setting is considered, where illegitimate nodes with common interests are grouped in a cluster. In order to confuse the different eavesdropping clusters, we consider artificial-noise-aided beamforming at the source node. Moreover, FD relay jamming is adopted to improve the system's security. To maintain secure communications against the untrusted relay node, a FD destination jamming scheme is adopted. Our proposed scheme is designed based on the channel state information of the legitimate nodes only. Numerical results show that the optimal power allocation factor between data and artificial noise depends on the total number of antennas of the different colluding eavesdropping clusters.

arXiv:1803.02412•Mar 6, 2018•0 citations

Securing Untrusted Full-Duplex Relay Channels in the Presence of Multiple External Cluster-Based Eavesdroppers

Asma Mabrouk, Ahmed El Shafie, Kamel Tourki +2 more

We investigate the physical layer security of a wireless cooperative network where communication between Alice and Bob is assisted by a full-duplex (FD) untrusted relay, Ray, in the presence of multiple external eavesdroppers, Eves. A cluster-based colluding eavesdropping setting is considered, where illegitimate nodes with common interests are grouped in a cluster. To confuse the different eavesdropping clusters, we employ artificial-noise (AN) aided beamforming at the source node. Moreover, FD relay jamming is used to improve the system's security. To maintain secure communications against the untrusted relay node, an FD destination jamming scheme is adopted. Our proposed scheme is designed based on the channel state information of the legitimate nodes only. We optimize the transmit power allocation factors between data and AN signals, the data and AN precoders at Alice, the AN precoder at Bob, and the data and AN precoders at Ray. Numerical results show that the optimal power allocation factor between data and AN depends on the total number of antennas of the different colluding eavesdropping clusters.

IEEE Systems Journal•May 24, 2019•4 citations

A joint random weighting method for physical layer security in wireless relay system

Suxia Guo, Xinsheng Ji, Keming Ma +1 more

In the wireless cooperative relay system, the private information can be intercepted by the untrusted relays. The traditional method of artificial noise based on physical layer security consumed much more power to protect the security of private information. To solve this problem, this paper combines amplify-and-forward coefficient of the relays with the joint channel state information (JCSI), and constructs the joint channel between the sender and the receiver. According to the joint channel characteristics the sender designs randomized weighting vector for its antenna, which is constant by multiplied with the joint channel characteristics. This method can make the equivalent channel be constant between the sender and the legitimate receiver while the equivalent channels change fast between the sender and the relays. Simulation results show that the bit error rate (BER) of Relays is almost 0.5 constantly and the BER of receiver is 10-3simultaneously when the received SNR is 10dB. Compared with the method based on artificial noise, 1.6dB power can be saved in the proposed method.

•Oct 1, 2014•0 citations

Research on physical layer security based on cooperative interference

Haiyan Huang, Yuxin Ai, Linlin Liang

Because of the openness of the wireless relay channel, the confidential information transmitted in the channel is very easy to be eavesdropped on by malicious eavesdroppers and cause information leakage. In specifically, a friendly jammer will transmit a jamming signal to confound an eavesdropper attempting to listen in on a relay transmission. For wireless relay networks using the Rayleigh fading channel model, this research proposes a physical layer security technique based on cooperative interference. In the system, we design two-time stages to realize the transmission of the source to the user. During the initial phase, the signal source transmits a composite signal to both the user and the relay. In the second phase, the confidential information is relayed and artificial noise is generated by friendly jammers to confuse eavesdroppers. Through our proposed method, we derive precise analytical expressions for the intercept probability (IP) and outage probability (OP). The correctness of the theoretical derivation is verified by numerical results and theoretical simulation.

International Conference on Computer Science and Communication Technology (ICCSCT)•Oct 11, 2023•0 citations

Joint Decode-and-Forward and jamming for wireless physical layer security with destination assistance

Yupeng Liu, Athina P. Petropulu, H. Vincent Poor

A distributed wireless network with one source, one destination, one eavesdropper and multiple Decode-and-Forward (DF) relays is considered. A two-slot cooperative relaying scheme is proposed, in which relays help the source transmit to the destination while keeping the message as secret as possible from the eavesdropper. In the first slot, the source transmits a weighted combination of the information bearing signal and a noise signal. At the same time, the destination cooperates with the source in transmitting a noise signal with the purpose of confounding the eavesdropper. In the second slot, the `best' relay cooperates with the source to send a jamming signal along the null space of the destination channel. Optimal relay selection and also optimal power allocation among the first/second slot data signal and jamming noise is proposed. With the proposed transmission scheme, the system secrecy rate is shown to outperform the methods in literature and always benefits from increasing total power and larger number of relays.

Asilomar Conference on Signals, Systems and Computers (ACSSC)•Nov 1, 2011•14 citations
In this letter, we consider a cooperation system with multiple untrusted relays (URs). To keep the transmitted information confidential, we obtain joint channel characteristics (JCCs) through combining the channels from the source to the destination. Then, in the null space of the JCCs, jammers construct artificial noise to confuse URs when the source node broadcasts its data. Through a distributed implementation algorithm, the weight of each node can be obtained from its own channel state information. Simulation results show that high-level security of the system can be achieved when internal and external eavesdroppers coexist.
To solve the problem of untrusted relays, we propose a physical layer security transmission mechanism in relay system. We get the joint channel characteristics by combining the two channels, source node to relay and relay to destination node, into one. Based on this, we construct artificial noise and add it to the transmission signal, in order to make the internal and external wire-tappers get none of the information. The optimal signal transmission power is calculated subsequently. Simulation results show that when the artificial noise lies in the null space of the legitimate receiver's channel, secrecy capacity of the cooperative relay system can be improved and the bit-error rate of the legitimate receiver is much smaller than wire-tappers.
This letter investigates the physical layer security in a wireless cooperative network where communication is assisted by a full-duplex (FD) untrusted relay in the presence of multiple external eavesdroppers. A cluster-based colluding eavesdropping setting is considered, where illegitimate nodes with common interests are grouped in a cluster. In order to confuse the different eavesdropping clusters, we consider artificial-noise-aided beamforming at the source node. Moreover, FD relay jamming is adopted to improve the system's security. To maintain secure communications against the untrusted relay node, a FD destination jamming scheme is adopted. Our proposed scheme is designed based on the channel state information of the legitimate nodes only. Numerical results show that the optimal power allocation factor between data and artificial noise depends on the total number of antennas of the different colluding eavesdropping clusters.
We investigate the physical layer security of a wireless cooperative network where communication between Alice and Bob is assisted by a full-duplex (FD) untrusted relay, Ray, in the presence of multiple external eavesdroppers, Eves. A cluster-based colluding eavesdropping setting is considered, where illegitimate nodes with common interests are grouped in a cluster. To confuse the different eavesdropping clusters, we employ artificial-noise (AN) aided beamforming at the source node. Moreover, FD relay jamming is used to improve the system's security. To maintain secure communications against the untrusted relay node, an FD destination jamming scheme is adopted. Our proposed scheme is designed based on the channel state information of the legitimate nodes only. We optimize the transmit power allocation factors between data and AN signals, the data and AN precoders at Alice, the AN precoder at Bob, and the data and AN precoders at Ray. Numerical results show that the optimal power allocation factor between data and AN depends on the total number of antennas of the different colluding eavesdropping clusters.
In the wireless cooperative relay system, the private information can be intercepted by the untrusted relays. The traditional method of artificial noise based on physical layer security consumed much more power to protect the security of private information. To solve this problem, this paper combines amplify-and-forward coefficient of the relays with the joint channel state information (JCSI), and constructs the joint channel between the sender and the receiver. According to the joint channel characteristics the sender designs randomized weighting vector for its antenna, which is constant by multiplied with the joint channel characteristics. This method can make the equivalent channel be constant between the sender and the legitimate receiver while the equivalent channels change fast between the sender and the relays. Simulation results show that the bit error rate (BER) of Relays is almost 0.5 constantly and the BER of receiver is 10-3simultaneously when the received SNR is 10dB. Compared with the method based on artificial noise, 1.6dB power can be saved in the proposed method.
Because of the openness of the wireless relay channel, the confidential information transmitted in the channel is very easy to be eavesdropped on by malicious eavesdroppers and cause information leakage. In specifically, a friendly jammer will transmit a jamming signal to confound an eavesdropper attempting to listen in on a relay transmission. For wireless relay networks using the Rayleigh fading channel model, this research proposes a physical layer security technique based on cooperative interference. In the system, we design two-time stages to realize the transmission of the source to the user. During the initial phase, the signal source transmits a composite signal to both the user and the relay. In the second phase, the confidential information is relayed and artificial noise is generated by friendly jammers to confuse eavesdroppers. Through our proposed method, we derive precise analytical expressions for the intercept probability (IP) and outage probability (OP). The correctness of the theoretical derivation is verified by numerical results and theoretical simulation.
A distributed wireless network with one source, one destination, one eavesdropper and multiple Decode-and-Forward (DF) relays is considered. A two-slot cooperative relaying scheme is proposed, in which relays help the source transmit to the destination while keeping the message as secret as possible from the eavesdropper. In the first slot, the source transmits a weighted combination of the information bearing signal and a noise signal. At the same time, the destination cooperates with the source in transmitting a noise signal with the purpose of confounding the eavesdropper. In the second slot, the `best' relay cooperates with the source to send a jamming signal along the null space of the destination channel. Optimal relay selection and also optimal power allocation among the first/second slot data signal and jamming noise is proposed. With the proposed transmission scheme, the system secrecy rate is shown to outperform the methods in literature and always benefits from increasing total power and larger number of relays.