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We recently proposed a flexible quantum secure direct communication protocol [Chin. Phys. Lett. 23 (2006) 3152]. By analyzing its security in the perfect channel from the aspect of quantum information theory, we find that an eavesdropper is capable of stealing all the information without being detected. Two typical attacks are presented to illustrate this point. A solution to this loophole is also suggested and we show its powerfulness against the most general individual attack in the ideal case. We also discuss the security in the imperfect case when there is noise and loss.

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Enhancing the security of quantum secret sharing against multiphoton attackZhang Bin-Bin(张彬彬) a) † , Wang Da-Qing(王大庆) a) , Huang Shan-Shan(黄珊珊) b) , and Liu Yu(刘 玉) b) ‡