Secret-Key-Aided Scheme for Securing Untrusted DF Relaying Networks

Ahmed El Shafie, Ahmed Sultan Salem, Asma Mabrouk, Kamel Tourki, Naofal Al-Dhahir

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This paper proposes a new scheme to secure the transmissions in an untrusted decode-and-forward (DF) relaying network. A legitimate source node, Alice, sends her data to a legitimate destination node, Bob, with the aid of an untrusted DF relay node, Charlie. To secure the transmissions from Charlie during relaying time slots, each data codeword is secured using a secret-key codeword that has been previously shared between Alice and Bob during the perfectly secured time slots (i.e., when the channel secrecy rate is positive). The secret-key bits exchanged between Alice and Bob are stored in a finite-length buffer and are used to secure data transmission whenever needed. We model the secret-key buffer as a queueing system and analyze its Markov chain. Our numerical results show the gains of our proposed scheme relative to benchmarks. Moreover, the proposed scheme achieves an upper bound on the secure throughput.
Original languageEnglish (US)
Pages (from-to)6727-6731
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Volume67
Issue number7
DOIs
StatePublished - Jan 30 2018

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