Find a way to keep snoops from tapping into other people information is a challenge which has been at the subatomic scale. Offered for the first time in 1984, quantum cryptography (QC) promises to send coded messages that are, according to the laws of quantum mechanics, impossible to crack. The technique is based on a principle of modern physics called the Heisenberg uncertainty principle, which says it is impossible to measure something subatomic level unchanged.
Quebec systems send information in the form of a stream of photons prepared specially representative of 0 and 1. If someone tries to listen, it modifies unintentionallly photons are transmitted, and the beneficiary of law is capable of detecting the failure. As a final layer of security, the beam of photons not encode the secret message, it does not contain an encryption key. So if some of the key is intercepted, the sender and recipient to detect photons amended and discard the part of the key. Once they have sent enough photons, the shared key is used to encrypt the message, which can be sent on the lines of communication with the public. But the key photon reliable to arrive at their destination.
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