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Encryption-Aided Physical Layer Security via Cooperative Jamming: Beyond Secrecy Capacity with Noisy Ciphertext

In this work, we propose a joint security approach based on physical layer security (PhySec) and noisy ciphertext to improve the secrecy rate of a relay network with cooperative jamming via two trusted relays. While the secrecy capacity has been considered as the maximum limit for a perfect secrecy...

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Main Authors: Sadig, Tarig, Maleki, Mehdi, Tran, Nghi H., Reza Bahrami, Hamid
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Maleki, Mehdi
Tran, Nghi H.
Reza Bahrami, Hamid
description In this work, we propose a joint security approach based on physical layer security (PhySec) and noisy ciphertext to improve the secrecy rate of a relay network with cooperative jamming via two trusted relays. While the secrecy capacity has been considered as the maximum limit for a perfect secrecy at the physical layer, we demonstrate that the consideration of error- prone ciphertext in encryption and its interaction with PhySec allows us to transmit above the PhySec capacity without any leakage. By formulating and solving a non-convex encryption- aided secrecy rate maximization problem, it is shown that beyond PhySec capacity performances can be achieved even in a simple jamming scenario in which the two jammers just send independent jamming signals. The optimal encryption-aware power allocation and the secrecy rate maximization solution are also established in the case of common jamming signals to further increase the secrecy rate. Numerical results are finally provided to demonstrate the superiority of the proposed joint security framework over traditional PhySec.
doi_str_mv 10.1109/WCNC55385.2023.10118748
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source IEEE Xplore All Conference Series
subjects Ciphers
Cooperative jamming
Decoding
Encryption
Error-prone ciphertext
Noise measurement
PHY security
Physical layer security
Rate-equivocation region
Relay networks
Resource management
Secrecy capacity
title Encryption-Aided Physical Layer Security via Cooperative Jamming: Beyond Secrecy Capacity with Noisy Ciphertext
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