Abstract
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.
Highlights
Security has maintained, over the last decades, a key role in wireless communications
Wireless Information-Theoretic Security suggests that perfect secrecy [1] in wireless communication between a transmitter and a legitimate receiver in the presence of an eavesdropper is achievable even when the average Signalto-Noise Ratio (SNR) of the main channel is less than the average SNR of the wiretap channel if both channels are considered to be characterized by quasistatic Rayleigh fading
The average SNRs of both main and wiretap channel were acquired via appropriate equipment and the Probability of Nonzero Secrecy Capacity was calculated in order to evaluate Wireless InformationTheoretic Security (WITS) in an actual outdoor environment with Obstructed-Line-ofSight (OLOS) and Non-Line-of-Sight (NLOS) schemes that comply with WITS main and wiretap channel assumptions (Rayleigh fading)
Summary
Over the last decades, a key role in wireless communications. Wireless Information-Theoretic Security has been determined in autonomic networks by considering. A series of experimental measurements were conducted in order to provide a test bed for computation and evaluation of these fundamental metrics of Wireless Information-Theoretic Security, in the scenario of moving users in autonomic networks. The average SNRs of both main and wiretap channel were acquired via appropriate equipment and the Probability of Nonzero Secrecy Capacity was calculated in order to evaluate WITS in an actual outdoor environment with Obstructed-Line-ofSight (OLOS) and Non-Line-of-Sight (NLOS) schemes that comply with WITS main and wiretap channel assumptions (Rayleigh fading).
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