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IEEE International Symposium on Information Theory (ISIT)

Performance of a secure wireless transmission method

H. Koorapaty, A. Hassan

Published Nov 7, 2002• 0 citations
Publisher

Abstract

A new technique for secure information transmission in a mobile environment using the short term reciprocity of the radio channel was described previously (see Proc. IEEE International Symposium on Information Theory, p.381, 1998). This paper evaluates the performance and security aspects of the technique.
DOI
10.1109/isit.2000.866566

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A new technique for secure information transmission in a mobile environment is described. While the method may be used for secure cryptographic key distribution, it also enables the transmission of information in a secure manner without resort to any cryptographic techniques. This is achieved by using the short term reciprocity of the mobile radio channel to communicate in a two step process. In the first step, the phase response of the channel is probed, and in the second step the information bearing signal is modified to pre-compensate for the phase effects of the channel. Since the channel impulse response between two users is different from the channel impulse responses between the users and an adversary, the method is secure.
Security in wireless networks has traditionally been considered to be an issue to be addressed separately from the physical radio transmission aspects of wireless systems. However, with the emergence of new networking architectures that are not amenable to traditional methods of secure communication such as data encryption, there has been an increase in interest in the potential of the physical properties of the radio channel itself to provide communications security. Information theory provides a natural framework for the study of this issue, and there has been considerable recent research devoted to using this framework to develop a greater understanding of the fundamental ability of the so-called physical layer to provide security in wireless networks. Moreover, this approach is also suggestive in many cases of coding techniques that can approach fundamental limits in practice and of techniques for other security tasks such as authentication. This paper provides an overview of these developments.
In recent years, secret key generation method based on the physical layer of wireless channel has been widely studied. Since Channel State Information (CSI) is a fine-grained characterization of channel information, there are currently many studies using CSI for key generation. However, existing CSI extraction tools have the problem that the time interval between uplink and downlink interaction is uncertain, which may result in insufficient reciprocity of CSI. In this paper, we propose a channel measurement method based on the response mechanism of the IEEE 802.11 protocol, and develop a low-cost and universal CSI extraction tool using ESP32. We further design and implement a wireless key generation system based on the tool. To evaluate the performance of the proposed method, we have conducted extensive experiments in an indoor environment. Results show that our method can obtain highly reciprocal CSI in both static and mobile scenarios and can achieve a high key generation rate at around 1788.23 bits/s.