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Unlike conventional anti-eavesdropping methods that always require additionalenergy or computing resources (e.g., in friendly jamming and cryptography-basedsolutions), this work proposes a novel anti-eavesdropping solution that comeswith mostly no extra power nor computing resource requirement. This is achievedby leveraging the ambient backscatter communications in which secretinformation can be transmitted by backscattering it over ambient radio signals.Specifically, the original message at the transmitter is first encoded into twoparts: (i) active transmit message and (ii) backscatter message. The activetransmit message is then transmitted by using the conventional wirelesstransmission method while the backscatter message is transmitted bybackscattering it on the active transmit signals via an ambient backscattertag. As the backscatter tag does not generate any active RF signals, it isintractable for the eavesdropper to detect the backscatter message. Therefore,secret information, e.g., secret key for decryption, can be carried by thebackscattered message, making the adversary unable to decode the originalmessage. Simulation results demonstrate that our proposed solution cansignificantly enhance security protection for communication systems.

Defeating Eavesdroppers with Ambient Backscatter Communications