Private Communications Using Optical Chaos

Abstract

After a brief summary of the basic methods for secure transmission using optical chaos, we report on most recent achievements, namely, on the comparison between the standard two-laser and the three-laser schemes and on the network architecture for multiuser secure transmission. From our investigations, we found that while both the basic twolaser and the three-laser schemes are suitable to secure data exchange, the three-laser scheme offers a better level of privacy due to its symmetrical topology. Moreover, while transmission based on optical chaos is usually restricted to point-to-point interconnections, a more advanced solution, derived from the well-known public key cryptography, allows for private message transmission between any couple of subscribers in a network.

Chaotic Secure Communication Based on Single Feedback Phase Modulation and Channel Transmission

“…Structure and performance of chaotic laser at receiving end are the same as that of chaotic laser at transmitting end. As the same chaotic signal is generated due to chaotic synchronization, original information transmitted can be extracted from the comparison signal by subtracting two signals [14]- [17]. Remarkable features of chaotic signal are that it is sensitive to initial value and system parameters, and has characteristics of noise-like and wide spectrum.…”