The backscatter communication system has tremendous potential in commercial applications, still very less work has been done to study the benefits of it. Backscatter communication system is the backbone of many low cost and low power distributed wireless systems. The data transmission between various nodes in wireless communication system always comes with the risk of third party interception. This leads to privacy and security breaches of the information. In this paper, physical layer security of backscatter wireless system for multiple eavesdropper, single tag, and single reader case is studied. Unique characteristics of the channel are used to provide security to signal transmission. In order to degrade the reception of the signal by eavesdropper, a noise injection scheme is proposed. The advantages of this approach are discussed for various cases while evaluating the impact of the key factors like antenna gain and location of the eavesdropper on the secrecy of the transmission. Analytical results indicate that if properly employed, the noise injection scheme improves the performance of backscatter wireless system.
The backscatter communication system has tremendous potential in commercial applications, still very less work has been done to study the benefits of it. Backscatter communication system is the backbone of many low cost and low power distributed wireless systems. The data transmission between various nodes in wireless communication system always comes with the risk of third party interception. This leads to privacy and security breaches of the information. In this paper, physical layer security of backscatter wireless system for multiple eavesdropper, single tag, and single reader case is studied. Unique characteristics of the channel are used to provide security to signal transmission. In order to degrade the reception of the signal by eavesdropper, a noise injection scheme is proposed. The advantages of this approach are discussed for various cases while evaluating the impact of the key factors like antenna gain and location of the eavesdropper on the secrecy of the transmission. Analytical results indicate that if properly employed, the noise injection scheme improves the performance of backscatter wireless system.
Backscatter wireless communication lies at the heart of many practical low-cost, low-power, distributed passive sensing systems. The inherent cost restrictions coupled with the modest computational and storage capabilities of passive sensors, such as RFID tags, render the adoption of classical security techniques challenging; which motivates the introduction of physical layer security approaches. Despite their promising potential, little has been done to study the prospective benefits of such physical layer techniques in backscatter systems. In this paper, the physical layer security of wireless backscatter systems is studied and analyzed. First, the secrecy rate of a basic single-reader, single-tag model is studied. Then, the unique features of the backscatter channel are exploited to maximize this secrecy rate. In particular, the proposed approach allows a backscatter system's reader to inject a noise-like signal, added to the conventional continuous wave signal, in order to interfere with an eavesdropper's reception of the tag's information signal. The benefits of this approach are studied for a variety of scenarios while assessing the impact of key factors, such as antenna gains and location of the eavesdropper, on the overall secrecy of the backscatter transmission. Numerical results corroborate our analytical insights and show that, if properly deployed, the injection of artificial noise yields significant performance gains in terms of improving the secrecy of backscatter wireless transmission.
Backscatter communication system is the backbone of many low cost and low power distributed wireless systems. This paper studies the physical layer security (PLS) performance of a backscatter system which contains several relays and an eavesdropper. We discuss the conditions for a positive secrecy rate of the system in two different situations. First, in the case of known information of eavesdropper, we use a sub-optimal relay selection method to secure backscatter communication and maximize the secrecy rate. The simulation results prove the suboptimal scheme with low complexity achieves the same effects as the optimal one. But the transmission rate is very low due to the difference between the main channel and eavesdropper channel is too little, so we put forward the second distinctive method. Second, without knowing any information of eavesdropper, we adopt the artificial noise (AN) technique to reduce the received signal to interference noise (SINR) of eavesdropper, and came to a conclusion that under the condition of the same system model, adding a weak AN greatly improves the secrecy rate compared to situation one, and it doesn't required to obtain any information of eavesdropper. In small power of this type of communication system, this method is also effective.
The applications of Wireless Sensor Networks (WSNs) are widespread in areas such as environmental monitoring, industrial automation, healthcare and smart infrastructures, where secure and reliable wireless communication is essential. The nature of a wireless channel, however, lends itself to the problem of eavesdropper-directed wireless sensor networking, interception and unauthorized access. This paper presents a secure physical layer communication system featuring the combination of channel estimator, physical layer key generator, artificial noise generator and adaptive power allocator to increase the confidentiality of physical layer communications and simultaneously achieve energy efficiency. A hybrid security mechanism is used, which takes advantage of the channel characteristics to create secret keys and to make the eavesdropper's signal reception worse by introducing controlled artificial noise. Key performance parameters considered for simulation-based evaluation are secrecy capacity, BER, PDR, Throughput, Energy consumption and Network lifetime. Results show that the secrecy capacity is 6.3 bps/Hz, the packet delivery ratio is 98.7%, the bit error rate is 10⁻⁶, and the network lifetime is 1675 rounds. The proposed framework is much more effective in terms of both communication security and energy efficiency than the traditional WSNs security schemes.
In this paper, we proposed a scheme that Injects artificial noise from the tag end (IANT) to enhance the physical layer security of the ambient backscatter communication (ABC) system. The difference between the ABC system and the traditional radio frequency identification system is whether it uses the radio frequency (RF) signals in the environment to supply energy and modulation information for passive tags. In the IANT scheme, we select the best tag to communicate with the reader according to the channel quality between tags and reader, and at the same time select another tag to generate artificial noise that affects the receiving effect of the eavesdropper. This paper uses the method of generating noise copies in the reader to reduce the interference of artificial noise on the signal received by the reader. The simulation results show that with the increase in channel quality between tags and reader and the increase in the number of tags, the proposed IANT scheme is significantly superior to the contrast scheme in terms of system achievable secrecy rate, effectively enhancing the physical layer security of the ABC system.
As the need of highly secure data transmission in wireless communication has increased rapidly, physical layer security gains a lots of attention recently. The transmission of confidential data between two legitimate users in the existence of the passive eavesdropper with quasi-static Rayleigh channel is considered. A new technique is proposed in which a friendly noise is incorporated with confidential data bearing signal such that it preserves the integrity of the signal and does not degrade the legitimate link. This friendly noise acts as jamming signal for eavesdropper. The analytical expression for secrecy outage probability of the proposed technique for both single and multiple antennas eavesdropper is derived. The secrecy performance of proposed technique is compared with the traditional direct transmission and the cooperative jamming schemes. The asymptotic nature of the outage probability is also studied for the different parameters. Numerical results are also presented to verify the analytical expressions of proposed model, which show that the proposed technique is better than the traditional direct transmission and the cooperative jamming schemes.
Various physical-layer techniques have so far been proposed to achieve perfect secrecy in wireless communication systems. In this framework, an approach is investigated to enhance secrecy using a helping interferer transmitted by a friendly node in the network, aiming at confusing a passive eavesdropper. Commonly, such physical layer security approaches rely on the injection of a noise-like signal to intentionally degrade the eavesdropper capacity. Instead, the use of a jamming signal with the same probability mass function as that of the actual data is proposed here. The gains of this approach are investigated via extensive symbol error rate measurements and evaluations of the achievable secrecy rates.