Optical medical image encryption scheme based on a biological interaction system

In optical imaging and sensing applications, reliable and efficient medical image encryption is essential for secure transmission. This work proposes a novel, to the best of our knowledge, security scheme that integrates a bio-interactive system (predator-prey model), compression techniques, and multi-directional diffusion, with emphasis on compatibility with optical sensing. Dynamic characteristics of the bio-interactive system are analyzed to confirm high randomness suitable for encryption. Based on compressive sensing principles, a dynamic threshold is introduced and a measurement matrix constructed via bio-interactive system to enhance reconstruction quality. A multi-directional diffusion mechanism is furtherly designed, which spreads along rows, columns, and diagonals, thereby enhancing diffusion affect. This scheme is verified to feature high key sensitivity, strong robustness against computational attacks, and efficient performance suitable for real-time optical medical image encryption.