Enhanced secure encryption scheme using dual chaotic models for OFDM-VLC system with HD-MMIM

Area of Science:

• Wireless Communication
• Optical Communication
• Information Security

Background:

• Visible light communication (VLC) offers high bandwidth and security potential.
• Orthogonal frequency division multiplexing (OFDM) is a key technology in modern VLC systems.
• Physical-layer security is crucial for protecting sensitive data in wireless networks.

Purpose of the Study:

• To propose a novel physical-layer security-enhanced scheme for OFDM-VLC systems.
• To integrate chaos models for a multi-level dynamic protection framework.
• To improve the transmission performance and security of VLC systems.

Main Methods:

• Implementation of a high-dimensional multi-mode index modulation (HD-MMIM) scheme.
• Integration of 1D Logistic chaos and 4D hyperchaotic models.
• Development of a multi-level encryption framework: bit stream XOR, index table encryption, and HD constellation rotation.

Main Results:

• The 6D-MMIM scheme demonstrated improved Q-factor by 0.63 dB and 1.12 dB compared to 4D-MMIM and 5D-MMIM.
• Optimal bias current range for 6D-MMIM was extended by 29.38 mA and 19.15 mA, respectively.
• The encryption scheme offers a key space of 10^198, effectively resisting brute-force attacks.

Conclusions:

• The proposed HD-MMIM scheme significantly enhances the security and transmission performance of OFDM-VLC systems.
• The multi-level encryption framework provides robust protection against unauthorized access.
• This innovative approach contributes to the development of secure and efficient visible light communication technologies.