Quantum cryptography works, you can use it to generate secure one-time pads over an open line, and IIRC you can readily buy the gear. The unbreakable part is guaranteed by physics not math. But it's pricey and too clunky for practical key distribution. Remember too the warning in the old PGP manual: there are other ways your enemies can get at your data, like burglary, kidnapping and torture. Security is always relative.
Biting the hand that feeds IT
