Mobility Assisted Secret Key Generation Using Wireless Link Signatures

We propose an approach where wireless devices, interested in establishing a secret key, sample the channel impulse response (CIR) space in a physical area to collect and combine uncorrelated CIR measurements to generate the secret key. We study the impact of mobility patterns in obtaining uncorrelat...

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Bibliographic Details
Published in2010 Proceedings IEEE INFOCOM pp. 1 - 5
Main Authors Junxing Zhang, Kasera, Sneha K, Patwari, Neal
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.03.2010
Subjects
Area measurement
Bit rate
Communications Society
Entropy
Extraterrestrial measurements
Foot
NIST
Physical layer
Size measurement
Testing
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Summary:We propose an approach where wireless devices, interested in establishing a secret key, sample the channel impulse response (CIR) space in a physical area to collect and combine uncorrelated CIR measurements to generate the secret key. We study the impact of mobility patterns in obtaining uncorrelated measurements. Using extensive measurements in both indoor and outdoor settings, we find that (i) when movement step size is larger than one foot the measured CIRs are mostly uncorrelated, and (ii) more diffusion in the mobility results in less correlation in the measured CIRs. We develop efficient mechanisms to encode CIRs and reconcile the differences in the bits extracted between the two devices. Our results show that our scheme generates very high entropy secret bits and that too at a high bit rate. The secret bits, that we generate using our approach, also pass the 8 randomness tests of the NIST test suite.
ISBN:1424458366
9781424458363
ISSN:0743-166X
2641-9874
DOI:10.1109/INFCOM.2010.5462231