access icon free Chaos-based physical-layer encryption for OFDM-based VLC schemes with robustness against known/chosen plaintext attacks

The technology of visible light communication (VLC) is regarded as an appealing technique for upcoming wireless indoor multimedia communications. Considering the broadcast aspect of visible light propagation, the visible light interface is exposed and approachable to both licensed and unlicensed parties settled within the illuminated region. In this study, the authors present a chaos-based physical-layer encryption method for orthogonal frequency division multiplexing (OFDM)-based VLC schemes with the ability to counter known-plaintext attacks (KPAs) and chosen-plaintext attacks (CPAs). A logistic map is utilised for the chaos mapping. The presented method produces dynamic ciphertexts by employing the random quality of the chaotic keys and input data. It uses a multiple-fold encryption protocol which implements chaotic scrambling of the subcarrier distribution in time and frequency domains, as well as chaotic polarity inversion of subcarriers. To generate the secret key, a chaotic key creation approach is introduced by including the position-sensitive and real-valued channel state information of the VLC channel. The presented method provides supreme confidentiality for the OFDM-based VLC schemes to counter KPAs, CPAs, brute-force attacks, and statistical attacks. The secrecy capacity of the presented method is improved by applying a pre-equalisation technique at the transmitter instead of the receiver.

Inspec keywords: multimedia communication; cryptography; optical communication; OFDM modulation; equalisers; chaotic communication; chaos

Other keywords: visible light communication; multiple-fold encryption protocol; chaotic keys; visible light interface; brute-force attacks; chaotic key creation approach; VLC channel; licensed parties; chaos-based physical-layer encryption method; known/chosen plaintext attacks; visible light propagation; orthogonal frequency division multiplexing; unlicensed parties; OFDM-based VLC schemes; chosen-plaintext attacks; wireless indoor multimedia communications; known-plaintext attacks; chaos mapping; statistical attacks; input data

Subjects: Modulation and coding methods; Radio links and equipment; Other topics in statistics; Multimedia communications; Data security; Interpolation and function approximation (numerical analysis); Communication channel equalisation and identification; Cryptography

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-opt.2018.5072
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