Binary Jamming Message Solutions for Source-Wiretapping Under Physical-Layer Security: Analysis and Design

Abstract

A distributed zero-beamforming-based cooperative jamming technique is useless when an eavesdropper detects the sharing seed. Further, currently alternatives are very limited when the eavesdropper is located near a source for wiretapping. This paper presents some solutions for this extreme case. The jammer node, which can be a relay or destination node, randomly generates and transmits a binary jamming message to both source and destination or to both source and relay node in the first phase. When these two receivers securely and correctly decode the message, the source creates and transmits another message based on the decoded message and the use of exclusive-or for its information message. Consequently, the next transmission can avoid the eavesdropping. We present a comparison between the proposed protocols and conventional protocols that do not send a binary jamming message. The system performance is analyzed and evaluated in terms of the exact closed-form outage probability over Reyleigh fading channels. The simulation results using a Monte-Carlo simulation are in complete agreement with the theoretical results.