Cryptanalysis and Improvement of the Controlled Quantum Secure Direct Communication by Using Four Particle Cluster States

In a recent study (Yang et al. in Int. J. Theor. Phys. 50:395–400, 2011 ), Yang et al. pointed out that the controller’s role in the quantum secure direct communication protocol (Zhang et al. in Int. J. Theor. Phys. 48:2971–2976, 2009 ) could be excluded unknowingly, the receiver can directly obtain...

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Bibliographic Details
Published inInternational journal of theoretical physics Vol. 53; no. 5; pp. 1495 - 1501
Main Authors Zhu, Zhen-Chao, Hu, Ai-Qun, Fu, An-Min
Format Journal Article
LanguageEnglish
Published Boston Springer US 01.05.2014
Subjects
Elementary Particles
Mathematical and Computational Physics
Physics
Physics and Astronomy
Quantum Field Theory
Quantum Physics
Theoretical
EPR pairs
Controlled secure direct communication
Cluster state
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Summary:In a recent study (Yang et al. in Int. J. Theor. Phys. 50:395–400, 2011 ), Yang et al. pointed out that the controller’s role in the quantum secure direct communication protocol (Zhang et al. in Int. J. Theor. Phys. 48:2971–2976, 2009 ) could be excluded unknowingly, the receiver can directly obtain the sender’s message without the permission of the controller, and then they presented an improved protocol. However, in this paper, we show that the dishonest controller in the improved protocol can steal the sender’s secret message without being detected. Meanwhile, we show that the controller’s role still can be excluded unknowingly in the improved protocol. An improvement is proposed to avoid these two flaws.
ISSN:0020-7748
1572-9575
DOI:10.1007/s10773-013-1949-9