Scientific American on Quantum Encryption

prostoalex writes "Scientific American claims that advances in commercially available quantum encryption might obsolete the existing factorization-based solutions: "The National Security Agency or one of the Federal Reserve banks can now buy a quantum-cryptographic system from two small companies - and more products are on the way. This new method of encryption represents the first major commercial implementation for what has become known as quantum information science, which blends quantum mechanics and information theory. The ultimate technology to emerge from the field may be a quantum computer so powerful that the only way to protect against its prodigious code-breaking capability may be to deploy quantum-cryptographic techniques.""

Comments

Baloney.

[Pendersempai]

Quantum cryptography is a solution in search of a problem. It cannot implement public key/private key cryptography, and it can transmit only through a single uninterrupted fiber-optic cable, not over the internet at large. Given those limitations (which I don't think can be surmounted), one might as well use tremendous, digital one-time pads. Transmission of the pads to the relevant parties should be strictly easier than the quantum cryptographic solution: if nothing else, generate terabytes of noise, store it on a RAID, and put it in a car with ten intensely loyal guys. After you've done that, you can send up to that amount of data securely over the internet at large, and no amount of quantum hocus-pocus will be able to decode it.