Secure Ad-hoc Routing Scheme

TL;DR

This paper presents a secure routing scheme for multihop wireless networks that dynamically selects relays based on channel conditions to enhance physical layer security against eavesdroppers.

Contribution

It introduces a hop-by-hop relay selection method combining routing and physical layer security, with analytical expressions for secrecy performance metrics.

Findings

Derived closed-form expressions for secrecy outage probability.

Provided asymptotic analysis for diversity gain.

Validated the effectiveness of the proposed scheme.

Abstract

This paper investigates on the problem of combining routing scheme and physical layer security in multihop wireless networks with cooperative diversity. We propose an ad-hoc natured hop-by-hop best secure relay selection in a multihop network with several relays and an eavesdropper at each hop which provides a safe routing scheme to transmit confidential message from transmitter to legitimate receiver. The selection is based on the instantaneous channel conditions of relay and eavesdropper at each hop. A theoretical analysis is performed to derive new closed form expressions for probability of non-zero secrecy capacity along with the exact end to end secrecy outage probability at a normalized secrecy rate. Furthermore, we provide the asymptotic expression to gain insights on the diversity gain.