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In early 2009, Xiu et al. (Opt. Commun. 282(2) 333–337 2009) presented a controlled deterministic secure quantum communication (CDSQC) protocol via a newly constructed five-qubit entangled quantum state. Later, Qin et al. (Opt. Commun. 282(13), 2656–2658 2009) pointed out two security loopholes in Xiu et al.’s protocol: (1) A correlation-elicitation (CE) attack can reveal the entire secret message;...
Based on the controlled quantum teleportation protocol, a controlled quantum secure direct communication scheme (CQSDC) protocol, which transmits a one-bit message via the Greenberger-Horne-Zeilinger entangled state, is presented by Gao et al. in [Chinese Phys. Vol. 14 (2005), No. 5, p. 893]. However, through this article we want to enlighten of the fact that, due to a flaw in the control function,...
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