摘要
The quantum secure direct communication （QSDC） protocol with a random basis and order is analysed and an effective attack, i.e. teleportation attack, is presented. An eavesdropper can obtain half of the transmitted secret bits with the help of this special attack. It is shown that quantum teleportation can be employed to weaken the role of the order-rearrangement encryption at least in a certain circumstance. Meanwhile, a possible improvement on this protocol is proposed, which makes it secure against this kind of attack.
The quantum secure direct communication （QSDC） protocol with a random basis and order is analysed and an effective attack, i.e. teleportation attack, is presented. An eavesdropper can obtain half of the transmitted secret bits with the help of this special attack. It is shown that quantum teleportation can be employed to weaken the role of the order-rearrangement encryption at least in a certain circumstance. Meanwhile, a possible improvement on this protocol is proposed, which makes it secure against this kind of attack.
基金
supported by the National High Technology Development Program of China (Grant No 2006AA01Z419)
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 (Grant No 9140C1101010601)
the Natural Science Foundation of Beijing of China(Grant No 4072020)
the Integrated Services Network Open Foundation
