“Very long lasers made of optical fibers offer a promising route to highly secure communications. Although not as secure as quantum key distribution, this new method, which relies on classical rather than quantum physics, provides faster communication over long distances. It would also be feasible with existing hardware, in contrast to quantum communication that will require development of new, and probably expensive, components.”
A new invention developed by Dr. Jacob Scheuer of Tel Aviv University’s School of Electrical Engineering promises an information security system that can beat today’s hackers — and the hackers of the future — with existing fiber optic and computer technology.”
Excerpt of the Dr Scheuer Web page on his research :
The distribution of a secret key is most probably the main Achilles’ heel of any secure communication system. To establish completely secure information transfer it is necessary for the two users to share a secret key, known only to them, before the communication can take place. In many practical scenarios, especially when the two users are separated by a large distance, this requirement is difficult to realize because secure transmission of the key requires a previously shared (additional) key. This loophole was one of the main incentives behind the attempts to develop physically (as opposed to algorithmically) secure key distribution schemes based on the fundamental properties of quantum mechanics. Although ideally such communication protocols are perfectly secure6, their practical implementation is not simple. Noise and attenuation in the quantum channel reduce significantly their efficiency, especially from the range and data rate aspects. Theoretical and experimental studies show that channel attenuation, noise and detectors dark-counts limit the key-establishing rates and the operational ranges of QKD systems.
The idea is to develop a new concept for key distribution, based on establishing a laser oscillation between sender and receiver. The suggested architecture offers potential key-establishing rates which are larger by several orders of magnitude than those of the currently demonstrated QKD systems, especially at long communication ranges.”