Abstract
Wireless channel reciprocity can be exploited by two users willing to achieve confidential communications over a public channel as a common source of randomness for the generation of a secret key. In this chapter, the important issue of signal synchronization between the two users is discussed and a simple and practical solution is proposed to overcome this problem. The proposed scheme is tested with a real measurements campaign aimed at extracting secret-keys from the physical parameters of ultrawide bandwidth channels in an indoor scenario. The proposed solution is proved to be effective, as shown in the numerical results that provide an insight on the rate of agreement between the keys separately generated by the two users.
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Notes
- 1.
Throughout the chapter we assume that the eavesdropper does not take any action apart from trying to listen Alice and Bob’ transmissions without being detected.
- 2.
This requires a mild synchronization among Alice and Bob which does not pose any challenging issue from a practical viewpoint.
- 3.
This is due to the fact that, using this technique, we cannot exploit the information content associated with the channel response phase spectrum.
- 4.
It has been shown via extensive measurement campaigns that indoor UWB channels become independent for antenna displacements larger than about 15 cm [19].
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Acknowledgments
We wish to thank Nicoló Decarli for setting up the experimental testbed.
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Pasolini, G., Paolini, E., Dardari, D., Chiani, M. (2016). Experimental Results on Secret-Key Extraction from Unsynchronized UWB Channel Observations. In: Baldi, M., Tomasin, S. (eds) Physical and Data-Link Security Techniques for Future Communication Systems. Lecture Notes in Electrical Engineering, vol 358. Springer, Cham. https://doi.org/10.1007/978-3-319-23609-4_7
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DOI: https://doi.org/10.1007/978-3-319-23609-4_7
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