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CSI-based versus RSS-based Secret-Key Generation under Correlated Eavesdropping

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Document pages: 30 pages

Abstract: Physical-layer security (PLS) has the potential to strongly enhance theoverall system security as an alternative to or in combination withconventional cryptographic primitives usually implemented at higher networklayers. Secret-key generation relying on wireless channel reciprocity is aninteresting solution as it can be efficiently implemented at the physical layerof emerging wireless communication networks, while providinginformation-theoretic security guarantees. In this paper, we investigate andcompare the secret-key capacity based on the sampling of the entire complexchannel state information (CSI) or only its envelope, the received signalstrength (RSS). Moreover, as opposed to previous works, we take into accountthe fact that the eavesdropper s observations might be correlated and weconsider the high signal-to-noise ratio (SNR) regime where we can find simpleanalytical expressions for the secret-key capacity. As already found inprevious works, we find that RSS-based secret-key generation is heavilypenalized as compared to CSI-based systems. At high SNR, we are able toprecisely and simply quantify this penalty: a halved pre-log factor and aconstant penalty of about 0.69 bit, which disappears as Eve s channel getshighly correlated.

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