Definition
A key exchange protocol between two parties that enables the calculation of a key on both sides while preventing an adversary to extract any nontrivial information about the key. The protocol assumes the parties have access to a correlated random source that is derived from the wireless communication link they employ. The adversary can be considered to be passive (eavesdropping) or active (modifying the communication environment).
Background
In a wireless environment, the received signal suffers from external distortions that include mean propagation pathloss, fading, interference from other users’ signals, and thermal noise. Among these causes, fading may change in an unpredictable way as the wireless environment changes due to the frequency, location, direction, and reflecting coefficients of the surrounding objects. The unpredictability of these factors presents a wireless channel as a (nonstationary) stochastic process that may contain a substantial amount of entropy.
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Recommended Reading
Aono T, Higuchi K, Ohira T, Komiyama B, Sasaoka H (2005) Wireless secret key generation exploiting reactance-domain scalar response of multipath fading channels. IEEE Trans Antennas Propag 53(11):3776–3784
Azimi-Sadjadi B, Kiayias A, Mercado A, Yener B (2007) Robust key generation from signal envelopes in wireless networks. In: ACM conference on computer and communications security, Alexandria, pp 401–410
Jana S, Premnath SN, Clark M, Kasera SK, Patwari N, Krishnamurthy SV (2009) On the effectiveness of secret key extraction from wireless signal strength in real environments. In: MOBICOM, Beijing, pp 321–332
Mathur S, Trappe W, Mandayam NB, Ye C, Reznik A (2008) Radio-telepathy: extracting a secret key from an unauthenticated wireless channel. In: MOBICOM, San Francisco, pp 128–139
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Kiayias, A., Yener, B. (2011). Key Generation Using Physical Properties of Wireless Communication. In: van Tilborg, H.C.A., Jajodia, S. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5906-5_55
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DOI: https://doi.org/10.1007/978-1-4419-5906-5_55
Publisher Name: Springer, Boston, MA
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