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IEICE Technical Report; IEICE Tech. Rep.

Evaluation of Physical Layer Security in Physical Layer Network Coding System with Untrusted Relay

Yamaguchi Kazuma, Osamu Takyu, Takeo Fujii, Tomoaki Otsuki Ohtsuki, Fumihito Sasamori, Shiro Handa

Published Jun 13, 2013• 1 citation
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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.
In Physical Layer Network Coding (PLNC), since the two sources access the relay station at a time, the relay station can hardly demodulate each information owing to the mutual interference between two transmitted signals. The PLNC achieves the high secure relay communication based on physical layer security (PLS). The source needs the transmit power control based on the channel state information (CSI) for maintaining the secure mutual interference. The untrusted relay, however, may impersonate the CSI for breaking it. So far, the authors have evaluated the amount of the leaked information to the untrusted relay by the impersonation of CSI but the leaked information is not maximal. For the countermeasure to the impersonation of CSI, the most powerful model of the untrusted relay to maximizing the leaked information is necessary. This paper constructs the optimal impersonation of CSI by a linear programing problem.
This paper investigates the physical layer security performance of an untrusted relay network in the finite blocklength regime. Lossy decode-and-forward (DF) relaying is considered at the untrusted relay. Different from conventional DF relaying, the relay always forwards information sequences to the destination even if error is detected at the relay, which can be utilized to enhance the security of the untrusted relay network. Based on the characteristics of short-packet communications, the reliable-and-secure probability is proposed and numerically derived for evaluating the security performance in the physical layer of the untrusted relay network. Reliable-and-secure probability represents the probability that the destination can recover the original message sent from the source, whereas the relays cannot. It is found that as long as the contribution of the transmit power of source and relays is balanced, a certain degree of reliable-and-secure probability can be held for short-packet communications in the untrusted relay network.