摘要
The security of the multiparty quantum secret sharing protocol proposed by Gao [G.Gao,Commun.Theor.Phys.52 (2009) 421] is analyzed.It is shown that this protocol is vulnerable since the agents' imperfectencryption scheme can be attacked by a powerful participant.We introduce a attack strategy called participant forciblemanipulation and analyze the information leakage in this protocol under this attack.At last,we give an improved versionof the original protocol.The improved protocol is robust and has the same efficiency as the original one.
基金
Supported by National Natural Science Foundation of China under Grant Nos.60873191,60903152,60821001
Specialized Research Fund for the Doctoral Program of High Education under Grant Nos.200800131016 and 20090005110010
Beijing Nova Program under Grant No.2008B51
Key Project of Chinese Ministry of Education under Grant No.109014
Beijing Natural Science Foundation under Grant Nos.4072020 and 4102055
