Security information and event management

Transmitter

Quantum mechanics

Linguistics

Philosophy

Cloud computing security

Computer security

Relay

Operating system

Telecommunications

Power (physics)

Computer science

Cloud computing

Computer network

Covert channel

Physics

Relay channel

Alice (programming language)

Transmission (telecommunications)

Programming language

Covert

Channel (broadcasting)

Wireless

Alice and Bob

IEEE Wireless Communications Letters

Covert communication aims to hide the existence of the transmissions to guarantee the security in wireless communications. In this letter, channel uncertainty is exploited to achieve covert communication in relay networks. The transmitter Alice sends messages to the legitimate receiver Bob with the help of a relay, while the warden Willie wants to detect the existence of the transmission. The channel uncertainty introduces confusions to degrade the performance of Willie's detection. We show that Alice can transmit ${O}$ (${n}$ ) bits in ${n}$ channel uses covertly with the help of relay and channel uncertainty. Numerical results are shown to illustrate the achievability and the performance of the considered scenario.

Covert Communication With the Help of Relay and Channel Uncertainty