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Chinese Physics Letters

Cryptanalysis and Improvement of a Quantum Network System of QSS-QDC Using χ-Type Entangled States

Gan Gao, Ming Fang, Mu-Tian Cheng

Published Nov 1, 2012• 7 citations
Publisher

Abstract

In the paper [ Chin. Phys. Lett. 29 (2012) 050303 ] of Hong et al., two quantum secret sharing protocols were proposed. We study the security of the second protocol and find that it is insecure. Acting as the communication center, Trent may eavesdrop Alice's secret messages without introducing any error. Finally, a feasible improvement of the second protocol is given.

DOI
10.1088/0256-307x/29/11/110305

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In the paper [ Chin. Phys. Lett. 29 (2012) 050303 ] of Hong et al., two quantum secret sharing protocols were proposed. We study the security of the second protocol and find that it is insecure. Acting as the communication center, Trent may eavesdrop Alice's secret messages without introducing any error. Finally, a feasible improvement of the second protocol is given.
Two quantum secret sharing (QSS) protocols in a multiuser quantum direct communication (QDC) network system were put forward by Hong et al. [ Chin. Phys. Lett. 29 (2012) 050303 ]. However, we find that either agent (Bob or Charlie) alone can obtain half the information about the sender's secret without collaboration with the other, which does not satisfy the security requirement of QSS. Moreover, the secret message sent by Alice in the second protocol can be eavesdropped on or its communication can be disturbed by the builder of quantum channels (Trent).
In the paper [ 2010 Chin. Phys. B 19 050306 ], Yang et al. put forward a novel three-party quantum secret sharing protocol of secure direct communication based on χ-type entangled states, they claimed that the scheme is secure. However, in this paper, we study the security of the protocol and find that it is insecure. Applying intercept and resend attack, the agent Bob can obtain Alice's secret without the help from the other agent Charlie. In the end, we give our effective modification for its improvement.