Experimental Quantum Cryptography

We describe results from an apparatus and protocol designed to implement quantum key distribution, by which two users, who share no secret information initially: 1) exchange a random quantum transmission, consisting of very faint ashes of polarized light 2) by subsequent public discussion of the sent and received versions of this transmission estimate the extent of eavesdropping that might have taken place on it, and nally 3) if this estimate is small enough, distill from the sent and received versions a smaller body of shared random information, which is certi ably secret in the sense that any third party's expected information on it is an exponentially small fraction of one bit. Because the system depends on the uncertainty principle of quantum physics, instead of usual mathematical assumptions such as the di culty of factoring, it remains secure against an adversary with unlimited computing power. A preliminary version of this paper was presented at Eurocrypt '90, May 21{...

• Type: Conference
• Year: 1990
• Where: EUROCRYPT
• Authors: Charles H. Bennett, François Bessette, Gilles Brassard, Louis Salvail, John A. Smolin
• Keywords: Cryptology, EUROCRYPT 1990, Quantum Key Distribution, Random Quantum Transmission, Subsequent Public Discussion