The Secure message authentication is an important part of quantum cryptography. The eavesdropper gains partial knowledge on the key in cryptography. Partial knowledge has little result on the authentication part of the system. Using BB84 protocol, the sender will generate the random number, the random number sent as a secret shared key. The secret shared key also called as check bits. The communication parties are getting together and then they form as a single group depending upon the category. It is proposed to share the information among the communicating parties using quantum cryptography without any attack.
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