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High Efficiency of Two Efficient QSDC with Authentication Is at the Cost of Their Security |
| QIN Su-Juan1,2, WEN Qiao-Yan1, MENG Luo-Ming1, ZHU Fu-Chen3 |
| 1State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 1008762State Key Laboratory of Integrated Services Network, Xidian University, Xi'an 7100713National Laboratory for Modern Communications, PO Box 810, Chengdu 610041 |
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QIN Su-Juan, WEN Qiao-Yan, MENG Luo-Ming et al 2009 Chin. Phys. Lett. 26 020312 |
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Abstract Two efficient protocols of quantum secure direct communication with authentication [Chin. Phys. Lett. 25(2008) 2354] were recently proposed by Liu et al. to improve the efficiency of two protocols presented in [Phys. Rev. A 75(2007)026301] by four Pauli operations. We show that the high efficiency of the two protocols is at the expense of their security. The authenticator Trent can reach half the secret by a particular attack strategy in the first protocol. In the second protocol, not only Trent but also an eavesdropper outside can elicit half-information about the secret from the public declaration.
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| Keywords:
03.67.H
03.65.Ud
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Received: 28 July 2008
Published: 20 January 2009
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