1School of Science, Beijing University of Posts and Telecommunications, Beijing 100876 2State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876 3National Laboratory for Modern Communications, P.O.Box 810, Chengdu 610041
Cryptanalysis and Improvement of Two GHZ-State-Based QSDC Protocols
1School of Science, Beijing University of Posts and Telecommunications, Beijing 100876 2State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876 3National Laboratory for Modern Communications, P.O.Box 810, Chengdu 610041
In a recent paper[J. Korean. Phys. Soc. 49(2006)459], two GHZ-state-based quantum secure direct communication protocols were presented. Here we point out that an eavesdropper can utilize a special property of GHZ states, i.e. "correlation-elicitable" to obtain half information of the transmitted secrets without being detected in both protocols. The particular attack strategy is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocols secure against this kind of attack.
In a recent paper[J. Korean. Phys. Soc. 49(2006)459], two GHZ-state-based quantum secure direct communication protocols were presented. Here we point out that an eavesdropper can utilize a special property of GHZ states, i.e. "correlation-elicitable" to obtain half information of the transmitted secrets without being detected in both protocols. The particular attack strategy is demonstrated in detail. Furthermore, a possible improvement is proposed, which makes the protocols secure against this kind of attack.
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2010, Vol. 27 
