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This paper points out that,due to a flaw in the sender’s encoding,the receiver in Gao et al.’s controlled quantum secret direct communication(CQSDC) protocol [Chin.Phys.14(2005),No.5,p.893] can reveal the whole secret message without permission from the controller.An improvement is proposed to avoid this flaw.
This paper points out that, due to a flaw in the sender’s encoding, the receiver in Gao et al.’s controlled quantum secret direct communication (CQSDC) protocol [Chin.Phys. 14 (2005), No. 5, p. 893 ] can reveal the whole secret message without permission from the controller. Improvement is proposed to avoid this flaw.