Cryptanalysis and improvement of controlled secure direct communication

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2013 Chinese Physical Society and IOP Publishing Ltd
, , Citation Shih-Hung Kao and Tzonelih Hwang 2013 Chinese Phys. B 22 060308 DOI 10.1088/1674-1056/22/6/060308

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1 National Cheng Kung University, Institute of Computer Science and Information Engineering, Tainan City 701, Taiwan, China

Dates

  1. Received 13 November 2012
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1674-1056/22/6/060308

Abstract

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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