Improving the security of quantum direct communication with authentication
نویسنده
چکیده
Two protocols of quantum direct communication with authentication [Phys. Rev. A 73, 042305 (2006)] are recently proposed by Lee, Lim and Yang. In this paper we will show that the authenticator Trent should be prevented from knowing the secret message of communication and the protocols can be eavesdropped by Trent using the the intercept-measure-resend attack. To fix this leak, we revise the original versions of the protocols by using the Pauli-Z operation σz instead of the original bit-flip operation X , and accordingly the protocol securities are improved.
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