http://www.arxiv.org/abs/physics/0509136
Dr. Laszlo Kish
"Kish said that quantum encryption -- communicating with single quantum particles, where one particle carries a single bit of information -- is considered absolutely secure because any eavesdropper will be discovered by the extra noise the eavesdropper introduces into the communication channel as soon as the eavesdropper tries to extract "noisy" information, or bits, from the channel. But Kish said quantum encryption is very fragile and is limited by expense, vibrations, thermal gradients, maintenance needs, speed and distance. Instead, Kish has proposed a classical, not quantum, encryption scheme that relies on classical physical properties -- current and voltage. He said his scheme is absolutely secure, fast, robust, inexpensive and maintenance-free and relies on simultaneous encrypting of information by both the sender and the receiver."
[Accepted for publication in an upcoming issue of the journal Physics Letters A. The paper was also featured in a recent issue of Science (vol. 309, p. 2148, 2005)].
