ABSTRACT
This chapter describes that the principles involved in Code Division Multiple Access (CDMA) and emphasizes on the similarities between CDMA and encryption using chaos, as an introduction to chaos-based encryption principles. It focuses on chaos-based encryption in optics and discusses the chaos generator chosen, and its particular dynamical properties in the context of encryption. The chapter reviews practical realizations of the chaos generator in optoelectronics as well as experimental characterization. It addresses coding and decoding problems with experimental results. The chapter examines some notions on security and cryptanalysis and reporting some research on other optical systems for chaos-based encryption systems. In contrast to quantum cryptography, chaos-based cryptography is not claim absolute security, but it is more attached to develop an alternate encryption scheme for high bandwidth telecommunication systems. Among the numerous experimental set-ups capable of generating chaos, one has to choose the most efficient one for encryption purposes.
