QUANTUM CRYPTOGRAPHY

SEMINAR ON QUANTUM CRYPTOGRAPHY : During the 20 th century and a half, the struggle between makers and code breakers codes have suffered reversals and complications. Unbreakable zero was invented in 1918, unbreakable even if it is not established until 1940. This figure was impractical because it requires the sender and recipient agree in advance the key - a large warehouse of the secret random number some of which were used every time a secret message was delivered. Encryption is the most practical short, re-keys, or not secret key at all, was developed in the 1970s, but today they remain in limbo mathematics, which is not broken and does not show safe. One unexpected recent development is the use of quantum mechanics of doing things reached the mathematics of encryption alone. quantum encryption devices typically employ individual photons of light, and take advantage of the uncertainty principle principle that the measurement of a quantum system in general bother him and give incomplete information about his condition before measurement. Listen in a quantum communication channel thus causes a disturbance unavoidable, alerting the legitimate users. Quantum cryptography exploits this, so that both parties 've never met and who do not share secret information in advance communicate in secrecy under the nose of an opponent.


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