Abstract

Signal encryption using chaos has been carried out especially using the idea of synchronized chaos developed by Pecora and Carroll (1). So far most of the studies were implemented with electrical circuits featuring low dimensional attractors. The simple chaotic processes thus obtained can, however, be defeated by an eavesdropper. One way to solve this security problem is by using hyperchaos i.e., chaos with multiple positive Lyapunov exponents in order to obtain a chaos with a high complexity. Practical realizations remain, however, to be developed. The question of optical synchronization of chaos has also been studied in optics, but results deal mostly with numerical simulations (2) except some unique demonstrations of control of laser chaos and digital encoded transmission (3).

© 1998 IEEE