Low-power Secret-key Agreement over OFDM

Information-theoretic secret-key agreement is perhaps the most practically feasible mechanism that provides unconditional security at the physical layer to date. In this paper, we consider the problem of secret-key agreement by sharing randomness at low power over an orthogonal frequency division mu...

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Bibliographic Details
Published in:arXiv.org 2013-02
Main Authors: Renna, Francesco, Laurenti, Nicola, Tomasin, Stefano, Baldi, Marco, Maturo, Nicola, Bianchi, Marco, Chiaraluce, Franco, Bloch, Matthieu
Format: Article
Language:English
Subjects:
Agreements
Information theory
Orthogonal Frequency Division Multiplexing
Randomness
Site planning
Online Access:Get full text
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Summary:Information-theoretic secret-key agreement is perhaps the most practically feasible mechanism that provides unconditional security at the physical layer to date. In this paper, we consider the problem of secret-key agreement by sharing randomness at low power over an orthogonal frequency division multiplexing (OFDM) link, in the presence of an eavesdropper. The low power assumption greatly simplifies the design of the randomness sharing scheme, even in a fading channel scenario. We assess the performance of the proposed system in terms of secrecy key rate and show that a practical approach to key sharing is obtained by using low-density parity check (LDPC) codes for information reconciliation. Numerical results confirm the merits of the proposed approach as a feasible and practical solution. Moreover, the outage formulation allows to implement secret-key agreement even when only statistical knowledge of the eavesdropper channel is available.
ISSN:2331-8422