Elsevier

Physics Letters A

Volume 360, Issue 6, 15 January 2007, Pages 748-750
Physics Letters A

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Comment on: “Quantum exam” [Phys. Lett. A 350 (2006) 174]

https://doi.org/10.1016/j.physleta.2006.08.016Get rights and content

Abstract

The security of quantum exam [B.A. Nguyen, Phys. Lett. A 350 (2006) 174] is analyzed and it is found that this protocol is secure for any eavesdropper except for a dishonest “student” who takes part in the exam. The particular attack strategy is demonstrated and a possible improvement of this protocol is presented.

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Acknowledgements

We thank Ba An Nguyen and the anonymous reviewer for helpful comments. This work was supported by the National Natural Science Foundation of China, Grant No. 60373059; the Major Research Plan of the National Natural Science Foundation of China, Grant No. 90604023; the National Laboratory for Modern Communications Science Foundation of China; the National Research Foundation for the Doctoral Program of Higher Education of China, Grant No. 20040013007; the Graduate Students Innovation Foundation

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