Secret Key Exchange using Private Random Precoding in MIMO FDD and TDD Systems

Hasan Taha, Emad Alsusa

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    Along with the ongoing evolution of multiple antennas
    communication systems, new physical layer security techniques
    are continuing to achieve higher levels of secrecy. Most
    physical layer approaches, however, concern time division duplex
    (TDD) channels which rely on using the channel reciprocity
    feature as a shared randomness, and tend to be associated with
    a large computational burden. In this paper, we propose a new
    physical layer method which utilizes private random precoding
    for exchanging the secret key bits in multiple-input multipleoutput
    (MIMO) systems. The principle of this method is to exploit
    the precoding matrix index (PMI) in a manner that produces low
    correlation at the adversary. A robust key exchange between the
    transmitter and the receiver is established by uniquely relating
    the secret key bits to the channel precoding matrix using a
    private version of the universal codebooks. What’s more is that
    the proposed method is applicable in, both, frequency division
    duplex (FDD) and TDD channels. The results demonstrate that
    the proposed method can offer superior performance in terms
    of the key agreement, secrecy level and computational load.
    Original languageEnglish
    JournalIEEE Transactions on Vehicular Technology
    Issue number99
    Publication statusPublished - 4 Oct 2016


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