Chapter

Communications in Interference Limited Networks

Part of the series Signals and Communication Technology pp 393-430

Date:

Physical-Layer Key Generation and Reconciliation

  • Jon WallaceAffiliated withLafayette College
  • , Rashid MehmoodAffiliated withBrigham Young University
  • , Rajesh SharmaAffiliated withIlmenau University of Technology
  • , Werner HenkelAffiliated withJacobs University Bremen Email author 
  • , Oana GraurAffiliated withJacobs University Bremen
  • , Nazia IslamAffiliated withJacobs University Bremen
  • , Alexandra FilipAffiliated withDLR

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Abstract

Physical layer security is a technique that makes use of the physical communication channel or medium to provide additional robustness to eavesdroppers and attackers. Key establishment exploiting a multiple-input multiple-output (MIMO) reciprocal wireless channel is proposed and its performance investigated, indicating that secure keys can be rapidly generated between two nodes, even in the presence of close eavesdroppers. The use of reconfigurable antennas is investigated and experimentally proven as a key establishment solution for static channels with limited multipath. Additionally, different options are discussed to handle key-differences due to non-correlated noise together with quantization, either by simply introducing guard intervals or by joint source coding with LDPC codes.