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- W2003723516 abstract "Physical-layer key extraction techniques attempt to derive a shared symmetric cryptographic key between two wireless devices based on the principle of channel reciprocity, which states that the signal envelope between two communicating devices is strongly correlated. A key security assumption made in previous literature is that the signal envelope observed by an adversary located greater than a half-wavelength away is uncorrelated with that shared between the two communicating devices; however, this assumption has yet to be rigorously evaluated in previous work on physical-layer key extraction. In this paper, we present an experimental analysis that examines the relationship between the channel measurements used to extract a symmetric key between two devices and those observed by one or more distantly located passive adversaries. We find that, contrary to previous assumptions, there does exist a strong correlation in measurements observed by adversaries located significantly greater than a half-wavelength away from two communicating wireless devices. Further, we provide initial results that show the extent to which the adversary is able to leverage such correlations to infer portions of the key extracted between two devices using previously published physical-layer key extraction techniques." @default.
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- W2003723516 date "2011-04-10" @default.
- W2003723516 modified "2023-10-16" @default.
- W2003723516 title "On passive inference attacks against physical-layer key extraction?" @default.
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- W2003723516 doi "https://doi.org/10.1145/1972551.1972559" @default.
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