English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

In this paper, we investigate joint information theoretic secrecy and covertcommunication in a single-input multi-output (SIMO) system where a transmitter(Alice) is communicating with two legitimate users (Bob and Carol). We considerthat an untrusted user and a warden node are also present in the networkattempting to attack the secure and covert communications to Bob and Carol,respectively. Specifically, Bob requires secure communications such that hismessages from Alice are not decoded by the untrusted user, while Carol requirescovert communications such that her messages from Alice are not detected by thewarden.  To do so, we consider that Alice transmits Carol's messages during selectedtime slots to hide them from the warden while also transmitting Bob's messagesin each time slot contentiously.  We formulate an optimization problem with the aim of maximizing the averagerate subject to a covert communication requirement and a secure communicationsconstraint.  Since the proposed optimization problem is non-convex, we utilize successiveconvex approximation to obtain a tractable solution. We consider practicalassumptions that Alice has imperfect knowledge of the warden's location andimperfect channel state information (CSI) of Bob and Carol.  Our numerical examples highlight that the imperfect CSI at Carol has a moredetrimental impact on the average rate compared to imperfect CSI at Bob.

Joint Information Theoretic Secrecy and Covert Communication in the Presence of an Untrusted User and Warden