High Efficiency of Two Efficient QSDC with Authentication Is at the Cost of Their Security |
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Authors: | QIN Su-Juan WEN Qiao-Yan MENG Luo-Ming ZHU Fu-Chen |
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Institution: | State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876State Key Laboratory of Integrated Services Network, Xidian University, Xi'an 710071National Laboratory for Modern Communications, PO Box 810, Chengdu 610041 |
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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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