Comment on “Cryptanalysis and Improvement of a Quantum Network System of QSS-QDC Using x-Type Entangled States” [Chin.Phys.Lett.29 (2012) 110305]

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（7）
• 页码范围: 264
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/7/079903

摘要

We point out that the quantum secret sharing (QSS) protocol proposed by Gao et al.[Chin.Phys.Lett.29110305 (2012)] has some defects.Thus,some strategies are given to mend them.Recently,Hong etal.[1] proposed two quantum secret sharing protocols of a quantum direct communication network (QSS-QDC protocols) by using fourqubit x-type entangled states.Unfortunately,Gao et al.[2] pointed out that the builder of quantum channels,Trent,can steal the sender Alice's secret message without being detected in the second QSS-QDC protocol and attempted to improve it to a secure protocol (hereafter we call it the GFC-QSS-QDC protocol).However,we find that the GFC-QSS-QDC protocol still has other defects.