Efficient quantum direct communication with authentication

Details Efficient quantum direct communication with authentication Efficient quantum direct communication with authentication

2007-11-22

arxiv.org/abs/0711.3502v2

Physics

Quantum Physics

6 pages, 3 figures and 4 tables

Scientific paper

10.1088/0256-307X/25/7/007

Two protocols of quantum direct communication with authentication [Phys. Rev. A 73, 042305(2006)], proposed by Lee, Lim, and Yang, recently were indicated to be insecure against the authenticator Trent's attacks [Phys. Rev. A 75, 026301(2007)]. In this paper, two efficient protocols of quantum direct communication with authentication are presented by utilizing four kinds of Pauli operation (I, X, Y, Z). These new protocols can transmit two bits message every GHZ state, instead of one bit in the aforementioned protocols. Analysis shows that they are secure against inner participant's attacks (such as Trent's attacks) as well as outer Eve's attacks. Finally, we generalize them to multiparty quantum direction communication.

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