Quantum cryptography:

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Conventional cryptosystems such as ENIGMA, DES, or even RSA, are based on a mixture of guesswork and mathematics. Information theory shows that traditional secret-key cryptosystems cannot be totally secure unless the key, used once only, is at least as long as the cleartext. On the other hand, the theory of computational complexity is not yet well enough understood to prove the computational security of public-key cryptosystems.

Post Author: sheri

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