The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state wit...The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller, and it will not be detected by any other users. Furthermore, by modifying the distribution process of particles and adding a detection step after each distribution process, we propose an improved protocol which can resist this kind of attack.展开更多
基金Project supported by the National High Technology Research and Development Program of China (Grant No 2006AA01Z419)the Major Research Plan of the National Natural Science Foundation of China (Grant Nos 90604023, 60873191 and 60821001)+2 种基金the National Laboratory for Modern Communications Science Foundation of China (Grant No 9140C1101010601)the Natural Science Foundation of Beijing, China (Grant No 4072020)the Integrated Service Network Open Foundation
文摘The security of quantum secret sharing based on entanglement swapping is revisited and a participant attack is presented. In this attack two dishonest agents together can illegally recover the secret quantum state without the help of any other controller, and it will not be detected by any other users. Furthermore, by modifying the distribution process of particles and adding a detection step after each distribution process, we propose an improved protocol which can resist this kind of attack.
