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IEEE Communications Letters

An Absolute Secure Wire-Line Communication Method Against Wiretapper

Sanjun Liu, Meng Ma, Yunzhou Li, Yingyang Chen, Bingli Jiao

Published Dec 7, 2016• 3 citations
Publisher

Abstract

This letter proposes a security method for wire-line point-to-point communication based on the information theory. The proposed system replaces the conventional receiver by a full-duplex node which can, not only, receive the confidential signal, but also deliver artificial noise to impair the channel of wiretapper observation between the two legitimate partners. The power ratio of the signal to the artificial noise is a key factor for guaranteeing absolute secure communication. The theoretical work is carried out in the model of physical layer security on the assumption that the wiretapper can perform the optimum detection, including with colluding structure. Numerical results are presented for demonstrating the effectiveness of the proposed approach.

DOI
10.1109/lcomm.2016.2636836

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IEEE Wireless Communications Letters•Oct 17, 2018•9 citations
This letter proposes a security method for wire-line point-to-point communication based on the information theory. The proposed system replaces the conventional receiver by a full-duplex node which can, not only, receive the confidential signal, but also deliver artificial noise to impair the channel of wiretapper observation between the two legitimate partners. The power ratio of the signal to the artificial noise is a key factor for guaranteeing absolute secure communication. The theoretical work is carried out in the model of physical layer security on the assumption that the wiretapper can perform the optimum detection, including with colluding structure. Numerical results are presented for demonstrating the effectiveness of the proposed approach.
This paper presents a design scheme of wire-line telephone system using self-interference (SI) cancellation technology in co-frequency co-time full-duplex (CCFD) system to realize absolute secure communication at the physical layer. This scheme can hide the target signal by skillfully releasing the high-power artificial noise to the whole link at the receiving node, and then make use of the receiver’s knowledge of the SI signal to achieve high dB SI cancellation with the help of analog domain SI cancellation technology in CCFD domain, so that the signal-to-noise ratio (SNR) received by the eavesdropper at any position of the link is far lower than that of the legitimate receiver, so as to realize the absolutely secure communication in the sense of Wyner principle. This paper not only puts forward the specific design scheme of absolutely secure communication telephone, but also analyzes the calculation of security capacity under different eavesdropping positions, different SI cancellation capability and different system parameters according to Shannon theory.
We discuss the physical layer security scheme in the Full-Duplex (FD) MIMO point-to-point two-way communication system with residual self-interference, in which legitimate nodes send confidential information and null space Artificial Noise (AN) while receiving information. Because the Channel State Information (CSI) of the eavesdropper is unavailable, we optimize the covariance matrices of the information signal as well as the allocation of the antenna for transmitting and receiving to minimize the signal power consumption under the target rate constraint. As a result, the power of AN is maximized within the limit of total power, so the interception capability of the eavesdropper is suppressed as much as possible. Since self-interference cannot be completely eliminated, the optimization process of one legitimate node depends on the optimization result of the other. By substituting self-interference power in the secrecy rate formula with its average value, the joint optimization process at the two nodes is transformed into two separate and solvable optimization processes. Then, the Water-Filling Algorithm (WFA) and bisection algorithm are used to get the optimal covariance matrices of the signal. Furthermore, we derive the theoretical lower bound of ergodic achievable secrecy rate under rayleigh channels to evaluate the performance of the scheme. The simulation results show that the theoretical derivation is correct, and the actual achievable rate is very close to the target rate, which means that the approximation in the optimization is feasible. The results also show that secrecy transmission can be realized because a considerable secrecy rate can be achieved.
This paper presents a secure wire-line telephone system that employs physical layer security (PLS) to protect against wiretapping. The system generates artificial noise (AN) in both transmission directions and uses a telephone hybrid circuit to effectively suppress the AN for the purpose of secure communication. Furthermore, we analyze the secrecy capacity of the system and evaluate its performance through theoretical analysis and practical experiments. The results demonstrate that the proposed system can significantly enhance communication security while preserving the integrity of legitimate signals. The results also validate that the proposed system is a robust and effective solution for securing wire-line telephone communications.
In this work, we propose a new channel training (CT) scheme to enhance physical layer security in a full-duplex wiretap channel, where the multi-antenna and full-duplex receiver simultaneously receives the information signal and transmits artificial noise (AN). In order to suppress the self-interference caused by AN, the receiver has to estimate the self-interference channel prior to the data communication phase. In the proposed CT scheme, the receiver transmits limited pilot symbols which are known only to itself, which prevents the eavesdropper from estimating the jamming channel from the receiver to the eavesdropper, hence effectively degrades the eavesdropping capability. Compared with the traditional CT scheme that uses publicly known pilots, the newly proposed secret CT scheme offers significantly better performance when the number of antennas at the eavesdropper is larger than one, e.g., Ne> 1. The optimal power allocation between CT and data/AN transmission at the legitimate transmitter/receiver is determined for the proposed secret CT scheme.
This paper proposes a novel secure channel estimation technique to provide security against leakage of the channel estimates to any malicious user by utilizing artificial noise (AN) along with full-duplex (FD) transmissions. AN overcomes the drawback of FD transmission, where any strategically located eavesdropper can minimize the interference signal received from the FD receiver. The proposed secure channel estimation technique comprises three stages, where the first stage is responsible for the estimation of the residual self-interference (SI) channel. The second stage acquires rough channel estimates to design AN orthogonal to the channel between legitimate transmitter-receiver for the next training stage. In the third stage, both legitimate nodes transmit orthogonal AN signals along with the known training signals using FD transmissions. For power allocation, we have presented a novel local adaptive power allocation algorithm at each legitimate node to allocate the powers to the training signals, and AN signals while ensuring equivocation at the eavesdropper. We provide the mean square error (MSE) to indicate the performance achieved by the respective nodes. We have also provided the bit error rate (BER) simulation analysis to indicate the secure communication achieved by securing the channel estimation process. The presented simulation analysis indicates that the eavesdropper is unable to decode the transmitted information while the legitimate receiver has robustly decoded the transmitted information.
This letter considers a new secure communication scenario where a full-duplex transmitter (Alan) needs to transmit confidential information to a half-duplex receiver (Bob), with an eavesdropper (Eve) that tries to overhear the confidential information. For realizing the secure communication, we design an effective artificial-noise-aided secure scheme (ANAS) which is composed of two phases' transmissions: in Phase 1, Alan and Bob transmit two independent artificial noises (ANs) simultaneously, while in Phase 2, Alan superimposes the AN received in Phase 1 with its confidential signal and sends out the mixed signal. Since the superimposed AN by Alan in Phase 2 can be effectively cancelled by Bob while remains an interference to Eve, a secrecy rate could then be achieved. Importantly, we derive the approximate closed-form solutions of the average secrecy rate and secrecy outage probability of ANAS under a Rayleigh block-fading channel. Numerical results show that the secrecy rate of ANAS is about twice higher than the benchmark scheme, even though in ANAS half of the time is used to transmit ANs.