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Originally Posted by acropolis
if you can securely transmit a one-time pad, you could just as easily transmit a secure message.
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Yes, that's right. but if the transmission system (be it a phone line or a man with a briefcase full of one time pads) is compromised, then the whole system falls apart. The principle behind quantum encryption, is that every time you have an uncompromisable one time pad, because you can tell if someone is tapping your transmission system (fiber optical cable or free space). The one time pad is generated by the sender and reciever and cannot be seen by anyone else during transmission. even the sender and reciever don't know what the pad will be until they have released certain publically available information between the two of them.