Waveform-Defined Security: A Low-Cost Framework for Secure Communications

Tongyang Xu

doi:10.1109/JIOT.2021.3127726

Waveform-Defined Security: A Low-Cost Framework for Secure Communications

2022-07-01

5

OA

AI

T

Tongyang Xu *

DOI：10.1109/JIOT.2021.3127726

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Communication security could be enhanced at the physical layer but at the cost of complex algorithms and redundant hardware, which would render traditional physical-layer security (PLS) techniques unsuitable for use with resource-constrained communication systems. This work investigates a waveform-defined security (WDS) framework, which differs fundamentally from traditional PLS techniques used in today's systems. The framework is not dependent on channel conditions, such as signal power advantage and channel state information (CSI). Therefore, the framework is more reliable than channel-dependent beamforming and artificial noise (AN) techniques. In addition, the framework is more than just increasing the cost of eavesdropping. By intentionally tuning waveform patterns to weaken signal feature diversity and enhance feature similarity, eavesdroppers will not be able to identify correctly the signal formats. The wrong classification of signal formats would result in subsequent detection errors even when an eavesdropper uses brute-force detection techniques. To get a robust WDS framework, three impact factors, namely, the training data feature, oversampling factor, and bandwidth compression factor (BCF) offset, are investigated. An optimal WDS waveform pattern is obtained at the end after a joint study of the three factors. To ensure a valid eavesdropping model, artificial intelligence (AI)-dependent signal classifiers are designed followed by optimal performance achievable signal detectors. To show the compatibility in available communication systems, the WDS framework is successfully integrated in IEEE 802.11a with nearly no adding computational complexity. Finally, a low-cost software-defined radio (SDR) experiment is designed to verify the feasibility of the WDS framework in resource-constrained communications

Keyword:

Internet of Things

Security

OFDM

Hardware

Physical layer security

Eavesdropping

Wireless LAN

Deep learning

encryption

Internet of Things (IoT)

machine learning

nonorthogonal

physical-layer security (PLS)

secure communications

signal classification

software-defined radio (SDR)

waveform

waveform-defined security (WDS)

Waveform-Defined Security: A Low-Cost Framework for Secure Communications

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