Eavesdropping on the improved three-party quantum secret sharing protocol

Tian‐Yin Wang, Qiaoyan Wen

Gan Gao, Xiaoxiang Wu, Xueying Cui +1 more

Gan Gao

Fu‐Guo Deng, Xihan Li, Hong-Yu Zhou

Security of the three-party quantum secret sharing (QSS) schemes based on entanglement and a collective eavesdropping check is analyzed in the case of considerable quantum channel losses. An opaque attack scheme is presented for the dishonest agent to eavesdrop the message obtained by the other agent freely, which reveals that these QSS schemes are insecure for transmission efficiencies lower than 50%, especially when they are used to share an unknown quantum state. Finally, we present a general way to improve the security of QSS schemes for sharing not only a private key but also an unknown quantum state.

Brian P. Williams, Joseph M. Lukens, Nicholas A. Peters +2 more

We describe and experimentally demonstrate a more practical three-party quantum secret sharing (QSS) protocol using polarization-entangled photon pairs. The source itself serves as an active participant and can switch between the required photon states by modulating the pump beam only, thereby making the protocol less susceptible to loss and amenable to fast switching. We derive a security proof based on quantum key distribution, demonstrating our QSS protocol to be secure against both eavesdropping and dishonest participants. Compared to three-photon protocols, the practical efficiency is dramatically improved as there is no need to generate, transmit, or detect a third photon.

Yan Feng-Li

A protocol of quantum secret sharing between one party and two parties using a practical three-particle entangled state is presented in this paper,which is based on during and after secret sharing construction.The protocol carries on the examination to eavesdrop for many times,so that it can promise the safeness of channel and the usability of the secret strings.