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Quantum Cryptography uses physics to develop a cryptosystem completely secure against being compromised without the knowledge of the sender or the receiver of the messages. The word quantum refers to the most fundamental behavior of the smallest particles of matter and energy. The Heisenberg Uncertainty Principle dictates that an adversary can’t look at these photons without changing or destroying them. A clever hacker will always find a way to exploit such security holes in some advanced technology in some ways, says Richard Hughes.