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Addendum to "Quantum secret sharing between multiparty and multiparty without entanglement"

Fu-Guo Deng·Feng-Li Yan·Xi-Han Li·Chun-Yan Li·Hong-Yu Zhou·Ting Gao
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Abstract

Recently, Yan and Gao proposed a quantum secret sharing protocol between multiparty ($m$ members in group 1) and multiparty ($n$ members in group 2) using a sequence of single photons (Phys. Rev. A \textbf{72}, 012304 (2005)). We find that it is secure if the quantum signal transmitted is only a single photon but insecure with a multi-photon signal as some agents can get the information about the others' message if they attack the communication with a Trojan horse. However, security against this attack can be attained with a simple modification.

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Fu-Guo Deng, Feng-Li Yan, Xi-Han Li, Chun-Yan Li, Hong-Yu Zhou, Ting Gao. 2005-08-23. Addendum to "Quantum secret sharing between multiparty and multiparty without entanglement". https://arxiv.org/abs/quant-ph/0508171

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