Physics – Quantum Physics
Scientific paper
2005-08-23
Physics
Quantum Physics
4 pages, 1 figure
Scientific paper
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.
Deng Fu-Guo
Gao Ting-Ting
Li Chun-Yan
Li Xi-Han
Yan Feng-Li
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