OptiFusion steganography method based on masking OFDM signal in Gaussian beam intensity

In free-space optical (FSO) communications, robust security is crucial. Multiple strategies, such as encryption and spatial diversity, are typically used. However, this research proposes optical steganography, which hides transmitted data rather than encrypting it. This study introduces “OptiFusion Steganography,” a novel technology that uses the shape and intensity of Gaussian beams to hide data by masking an Orthogonal Frequency Division Multiplexing (OFDM) signal within the optical beam. Simulations tested the OptiFusion method under various atmospheric conditions and propagation distances, demonstrating its significant enhancement of FSO communication security, with resilience against both minor and severe turbulences.