ABSTRACT: Cryptography is the science of writing in secret message and is an ancient art. In data and telecommunications, cryptography is necessary when communicating over any untrusted medium, which includes just about any network, particularly over the Internet. Over the last two decades an interesting field of the cryptography has raised from non classical atomic theory, Quantum Physics. This field is known as Quantum cryptography. Unlike the classical cryptography of public and private key ciphers which analyse the strength of a cipher by means of mathematical attacks and formulas, the security of the quantum cryptography is ensured by laws of Quantum Physics. In this paper, we present a method for three party authentication using quantum cryptography. Our method depends on partial trusted third party, so that the key is not revealed to the trusted third party
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