Originally posted here by XTC46
they lost my interest when they said it will be impossible to hack... No code is uncrackable...some just take more time than others.

While quantum encryption could be the victim of a MITM attack the attacker would always leave a trace that they have listened in on the conversation. That is the main strength of this type of encryption. The reason being is that the state of the photon will be measured by the receiver, if someone intercepts the communication between the sender and the receiver the state of the photon will change. In those situations the encryption, the one-time pad, would be changed, or the communications would be stopped. Which for all intensive purposes does make this type of encryption unhackable given current technology.

One time pad encryption schemes are really unbreakable as long as the key is only used once and it always kept secret. Given that the one time key is usually generated on the fly and sent between the two parties as the start of the conversation there is really no way to defeat a properly configured QE system. If an attacker is listening in when the one time pad is sent between both parties another pad is generated until it is sent without being intercepted. The ways in which the one-time pad is sent can also get very complicated and by the mere nature of the way they are sent prohibit an attacker from calculating the pad.

This is definitely not the kind of encryption that a group of underground hackers would be able to compromise. The only people who would have the money and other resources to even try to break this would be large governments. Even then, according to quantum mechanics it can't be done. So we would have to learn something new about quantum physics that we currently don't know, which is a lot, in order to even conceive of a way to break it.