Optical Chaos Synchronization and Spatio-temporal Digital Cryptography

The Optical chaotic systems, with infinite dimensionality, have gained a lot of attention for communication and cryptographic purposes. The semiconductor devices act as a cryptosystem with high bandwidth. We explore the synchronization phenomenon between two spatio-temporal chaotic semi conductor lasers with bi-directional coupling. The coupling facilitates two way simultaneous communication. The ease of modular implementation of optical feedback together with the randomness and ergodic properties of the infinite dimensional systems produces completely randomized chaotic time series. Such a system is an ideal candidate for cryptographic purposes of large streams of data such as a digital image. The system renders enough confusion and diffusion properties to the transmitted gray scaled image rendering the statistically disordered cipher image totally incoherent from the original message. Simulation result and statistical tests demonstrate the merit of the system in achieving robust and secure cryptography with deterministic chaos aiding in the correct recovery of the encoded image.

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