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AuthorBadawy A.
AuthorElfouly T.
AuthorKhattab T.
AuthorChiasserini C.-F.
AuthorMohamed A.
AuthorTrinchero D.
Available date2022-04-21T08:58:28Z
Publication Date2016
Publication NameWireless Communications and Mobile Computing
AbstractThe vast majority of existing secret key generation protocols exploit the inherent randomness of the wireless channel as a common source of randomness. However, independent noise added at the receivers of the legitimate nodes affects the reciprocity of the channel. In this paper, we propose a new simple technique to generate the secret key that mitigates the effect of noise. Specifically, we exploit the estimated channel to generate a secondary random process (SRP) that is common between the two legitimate nodes. We compare the estimated channel gain and phase to a preset threshold. The moving differences between the locations at which the estimated channel gain and phase exceed the threshold are the realization of our SRP. We study the properties of our generated SRP and derive a closed form expression for the probability mass function of the realizations of our SRP. We simulate an orthogonal frequency division multiplexing system and show that our proposed technique provides a drastic improvement in the key bit mismatch rate between the legitimate nodes when compared with the techniques that exploit the estimated channel gain or phase directly. In addition to that, the secret key generated through our technique is longer than that generated by conventional techniques. Moreover, we compute the conditional probabilities used to estimate the secret key capacity. Copyright 2016 John Wiley & Sons, Ltd. Copyright 2016 John Wiley & Sons, Ltd.
PublisherJohn Wiley and Sons Ltd
SubjectChannel estimation
Frequency division multiplexing
Local area networks
Multiplexing equipment
Network layers
Orthogonal frequency division multiplexing
Random processes
Closed-form expression
Conditional probabilities
Conventional techniques
OFDM systems
Orthogonal frequency division multiplexing systems
Physical layer security
Probability mass function
Secret key generations
TitleRobust secret key extraction from channel secondary random process
TypeConference Paper
Issue Number11
Volume Number16

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