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Lecture notes in computer science

Research on Physical Layer Security Scheme Based on OAM

Weiqing Huang, Yan Li, Wei Dong, Qiaoyu Zhang

Published Jan 1, 2019• 4 citations
Publisher
DOI
10.1007/978-3-030-23597-0_47

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In this paper, we propose a physical layer secret key (PLSK) generation scheme for secure encrypted transmissions in orbital angular momentum (OAM) communication systems which improves the secret key capacity via taking advantage of OAM orthogonal modes. Based on the line-of-sight (LoS) quasi-static channel conditions in OAM systems, we propose a mode-based active defense phase in the PLSK scheme to invalidate keys generated by an eavesdropper when it is extremely close to the legitimate user. Our simulation results highlight that the key information generated by the eavesdropper is almost zero in the case of highly correlated legitimate and eavesdropping channels under LoS conditions. In addition, our proposed OAM PLSK scheme achieves a higher key generation rate (KGR) than existing works since mode-based active defense can disrupt the process of PLSK by the eavesdropper.
The significant concepts in the area of wireless communication are cooperative communication and physical layer security. Since current related research does not involve detailed performance analysis in different scenarios, the performance in different scenarios between amplify-and-forward scheme and cooperative-jamming scheme is compared. In combination with the characteristics of the both concepts, the physical layer security model based on cooperative communication, and the optimal secrecy capacity on amplify-and-forward scheme and cooperative-jamming scheme is analyzed. The number increase of antennas for relays can improve the secrecy performance, just like the number increase of relays. Simulation results show that amplify-and-forward scheme is more difficult to be effected by the scenarios and is more stable than cooperative-jamming scheme.
This paper presents a physically-secure wireless communication system utilizing orbital angular momentum (OAM) waves at 0.31THz. A trustworthy key distribution mechanism for symmetric key cryptography is proposed by exploiting random hopping among the orthogonal OAM-wave modes and phases. Keccak-f[400] based pseudorandom number generator provides randomness to phase distribution of OAM-wave modes for additional security. We assess the security vulnerabilities of using OAM modulation in a THz communication system under various physical-layer threat models as well as analyze the effectiveness of these threat models for varying attacker complexity levels under different conditions.