Researchers have been making progress toward practical optical encryption systems that exploit laser dynamics. In two recent papers, researchers in France and Japan have shown how feedback-loop-based systems can be best used, and have introduced a new kind of modulation scheme. The separate results demonstrate both the security and ease of decoding of one class of the emerging chaotic-shift keying (CSK) systems, and the applicability of the other to a wide range of systems.
展开▼