The hardest part to understand is most certainly just the way that quantam mechanics work. Luckily I have studied this in another computer science lesson. It is hard to really wrap your head around the idea that observing data will change data, but that is the basis of quantum cryptography.
The cooles thing is how quantum mechanics work. It does provide us with a potential to transfer keys securely. It does seem strange that we couldn't just use this medium for transfering data itself. Since no one can observe it without changing it, then why don't we just find a way to send messages over this channel. Thus we impede key easedropping on standard communicaiton.
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