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Cryptanalysis and improvement of controlled secure direct communication

         

摘要

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.

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