Quantum Cryptography Vs Thermodynamics
A researcher claims that the second law of thermodynamics provides greater secrecy than quantum cryptography.
Laszlo Kish from Texas A&M University says the same law that prohibits perpetual motion machines more or less guarantees complete security in communications. According to MIT Tech Review, the idea is straight forward.
Alice sends Bob a message via an ordinary wire using different resistance for 0s and 1s. Alice connects to the wire in a a desired sequence while Bob uses a random sequence. The result is noise, which is public. Here's what's different: Bob knows what he connected, so he can back out his connection, leaving Alice's coded message behind.
Eve, who is trying to eavesdrop, does not know what connections either Alice or Bob chose, so she cannot decipher the message.
The timing of Kish's work comes as researchers Hoi-Kwong Lo, Marcos Curty, and Bing Qi have been systemically poking holes in communications based on quantum computing. For example, they can tell when a quantum-encrypted communication has been intercepted, and they have also found ways to inject a Trojan horse into the quantum-based communication.
If Kish has found a more secure method of communicating, then we might see a shift away from quantum physics and toward thermodynamics instead.