The quantum cryptography communication is the combination of classical cryptography theory and quantum mechanics.

量子密码通信是经典密码学与量子力学相结合的新兴交叉学科。

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Quantum cryptograph has extraordinary adaptability to the optical communication and unconditional security which classical cryptography has been striving for.

量子密钥分配特别适合光通信环境，而且可以实现无条件安全性。

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RSA, as a classical public key cryptosystem and a very important part of the cryptography, is the keystone and difficulty of the cryptography teaching.

RSA 是经典的公钥密码体制，是密码学中非常重要的一部分内容，是教学的重点和难点。

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That does not matter for classical telecoms, but matters very much for quantum cryptography, which relies on the fact that no eavesdropper can intercept the message without changing those quantum states, and thus giving away the fact that he is on the line.

ECONOMIST: Quantum information technology