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Wireless Information-Theoretic Security in an Outdoor Topology with Obstacles: Theoretical Analysis and Experimental Measurements

Tasos Dagiuklas, Theofilos Chrysikos, Stavros A. Kotsopoulos

Published Jan 1, 2011• 0 citations
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This paper presents a Wireless Information-Theoretic Security (WITS) scheme, which has been recently introduced as a robust physical layer-based security solution, especially for infrastructureless networks. An autonomic network of moving users was implemented via 802.11n nodes of an ad hoc network for an outdoor topology with obstacles. Obstructed-Line-of-Sight (OLOS) and Non-Line-of-Sight (NLOS) propagation scenarios were examined. Low-speed user movement was considered, so that Doppler spread could be discarded. A transmitter and a legitimate receiver exchanged information in the presence of a moving eavesdropper. Average Signal-to-Noise Ratio (SNR) values were acquired for both the main and the wiretap channel, and the Probability of Nonzero Secrecy Capacity was calculated based on theoretical formula. Experimental results validate theoretical findings stressing the importance of user location and mobility schemes on the robustness of Wireless Information-Theoretic Security and call for further theoretical analysis.

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In this paper, we designed a remote secure communication system based on the Message Queuing Telemetry Transport (MQTT) protocol for wireless channel key generations. We firstly propose a better performance quantization method, then simulate the performance of polar codes based wireless channel secret key generation system by different key quantization methods and orders. In the experimental research, a remote wireless key generation system was proposed and established for the first time by N210 Universal Software Radio Peripheral (USRP) platforms. We collected six indoor and outdoor Channel State Information (CSI) scenarios, a Polar codes based forward secure communication system is designed to resist mismatching of quantified key bits due to the channel non-reciprocities. When the terminal is in the indoor environment, the success transmission rate could reach 100% without people movement, and in the case of outdoor Line-Of-Sight (LOS), the success transmission rate is around 90% in both LOS and Non-line-of-sight (NLOS) scenarios.

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This paper presents a Wireless Information-Theoretic Security (WITS) scheme, which has been recently introduced as a robust physical layer-based security solution, especially for infrastructureless networks. An autonomic network of moving users was implemented via 802.11n nodes of an ad hoc network for an outdoor topology with obstacles. Obstructed-Line-of-Sight (OLOS) and Non-Line-of-Sight (NLOS) propagation scenarios were examined. Low-speed user movement was considered, so that Doppler spread could be discarded. A transmitter and a legitimate receiver exchanged information in the presence of a moving eavesdropper. Average Signal-to-Noise Ratio (SNR) values were acquired for both the main and the wiretap channel, and the Probability of Nonzero Secrecy Capacity was calculated based on theoretical formula. Experimental results validate theoretical findings stressing the importance of user location and mobility schemes on the robustness of Wireless Information-Theoretic Security and call for further theoretical analysis.
The increasing use of Internet of Things (IoT) also make data security a very importance. Traditional cryptographic methods are often unsuitable for IoT due to limited processing power and memory capacity, creating a need for lightweight yet effective security solutions. Physical Layer Key Generation (PLKG) offers a promising approach by utilizing the unique characteristics of wireless communication channels to generate secret keys without overloaded system demands. This paper show a performance analysis of Group Secret Key Generation in outdoor environments. The challenges are interfrence, physical obstacles, and dynamic changes in the communication channel was also the part of this analysis. The test results show that group secret key generation achieved optimal performance in Scenario 2, which given a correlation coefficient of 63 %, indicating strong channel similarity between nodes and a bit retention rate of 97.9 % after quantization and error correction. Scenarios 1, 3, and 4 also show a good performance, with correlation coefficients of41%,14%41 \%, 14 \%41%,14%, and 35 %, and corresponding bit retention rates of93.1%,90.9%93.1 \%, 90.9 \%93.1%,90.9%, and 95.2 %, on each tests. All scenarios successfully met the entropy thresholds required for cryptographic applications, which include that randomness and security of the generated keys was confirmed.
In this paper, we designed a remote secure communication system based on the Message Queuing Telemetry Transport (MQTT) protocol for wireless channel key generations. We firstly propose a better performance quantization method, then simulate the performance of polar codes based wireless channel secret key generation system by different key quantization methods and orders. In the experimental research, a remote wireless key generation system was proposed and established for the first time by N210 Universal Software Radio Peripheral (USRP) platforms. We collected six indoor and outdoor Channel State Information (CSI) scenarios, a Polar codes based forward secure communication system is designed to resist mismatching of quantified key bits due to the channel non-reciprocities. When the terminal is in the indoor environment, the success transmission rate could reach 100% without people movement, and in the case of outdoor Line-Of-Sight (LOS), the success transmission rate is around 90% in both LOS and Non-line-of-sight (NLOS) scenarios.