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Transmit Power Control for Secure Information Sharing in Untrusted Relay with Two Antennas

Noguchi Tetsuya, Osamu Takyu, Takeo Fujii, Tomoaki Otsuki Ohtsuki, Fumihito Sasamori, Shiro Handa

Published Oct 12, 2017• 0 citations
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Relay network assisted wireless terminal has an advantage for easily constructing wireless network but a disadvantage for information leak to the wireless terminal. For secure wireless communication, an encryption but the sharing of secrete key between information source and destination are required. A secure information sharing with artificial noise and mirroring null steering for avoiding the information leak to untrusted relay has been proposed. In this paper, for enhancing the security of this proposed secure information sharing, we consider two transmit controls, transmit power control (TPC) and the adaptive node selection of information source. We evaluate the secure capacity by computer simulation.

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Relay network assisted wireless terminal has an advantage for easily constructing wireless network but a disadvantage for information leak to the wireless terminal. For secure wireless communication, an encryption but the sharing of secrete key between information source and destination are required. A secure information sharing with artificial noise and mirroring null steering for avoiding the information leak to untrusted relay has been proposed. In this paper, for enhancing the security of this proposed secure information sharing, we consider two transmit controls, transmit power control (TPC) and the adaptive node selection of information source. We evaluate the secure capacity by computer simulation.
This paper proposes the novel secure information sharing among wireless nodes by the physical layer security based on multi-antenna null steering. For secure wireless communication, the secure information like the common key of cypher should be shared among nodes before data transmission. However, in wireless adhoc network, the untrusted relay node may steal the data under relay process. In the proposed sharing, a source node and two sink nodes send the information conveying signal and the artificial noises to relay station, simultaneously for avoiding decoding the information in the untrusted relay. After amplifying and forwarding relay, the two nodes do not decode the information from the received signal without removing artificial noises. The untrusted relay constructs the null steering with two antennas for removing the artificial noise. Since the channel transfer functions through which the two artificial noises are passed are common, the null points to two sink nodes can be constructed. As a result, the two nodes can remove the artificial noises. This null steering is mirroring null steering. The computer simulation shows the effect of proposed information sharing in terms of secure capacity.
We proposed the physical layer security (PLS) under the untrusted relay in the wireless communication with the physical layer network coding (PLNC). In PLNC, the two information source accesses the relay station, simultaneously and thus it is difficult for the relay station to demodulate each signal due to the masking-effect from the other signal. As a result, the leakage of information to the untrusted relay is avoidable. The transmit power control (TPC) for the balancing between the two received signal powers is powerful. The secure capacity is enlarged but has not been optimized for maximizing the secure capacity. In this paper, the quasi-optimization of TPC for enlarging secure capacity is derived in the wireless communication with the untrusted relay and PLNC.