Just because its proven to be not broken doesn't mean you can't attack the way its implemented. They exploit the error rate in the system and this allows them t

Just because its proven to be not broken doesn't mean you can't attack the way its implemented. They exploit the error rate in the system and this allows them to break the encryption. See http://www.technologyreview.com/view/418968/commercial-quantum-cryptography-system-hacked/ http://www.technologyreview.com/view/418968/commercial-quant... for more information.