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Cryptanalysis and Improvement of the Controlled Quantum Secure Direct Communication by Using Four Particle Cluster States |
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| Authors: | Zhen-Chao Zhu Ai-Qun Hu An-Min Fu |
| Affiliation: | 1. Information Security Research Center, Southeast University, Nanjing, 210096, China 2. State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences, Beijing, 100093, China 3. School of Computer Science and Technology, Nanjing University of Science and Technology, Nanjing, 210094, China |
| Abstract: | 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. |
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