摘要
We analyse the security of a quantum secure direct communication （QSDC） protocol and find that an eavesdropper can utilize a special property of GHZ states to elicit all or part of the transmitted secrets without being detected. The particular attack strategy is presented in detail. We give an improved version of this protocol so that it can resist this attack.
We analyse the security of a quantum secure direct communication （QSDC） protocol and find that an eavesdropper can utilize a special property of GHZ states to elicit all or part of the transmitted secrets without being detected. The particular attack strategy is presented in detail. We give an improved version of this protocol so that it can resist this attack.
基金
Supported by the National High-Tech Research and Development Programme of China under Grant No 2006AA01Z419, the Major Research Plan of the National Natural Science Foundation of China under Grant No 90604023, the National Laboratory for Modern Communications Science Foundation of China under Grant No 9140Cl101010601, and the Natural Science Foundation of Beijing under Grant No 4072020.
