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Improved Quantum ＂ ping-pong＂ protocol Based on Extended Three-Particle GHZ State

China Communications 2012年第1期9卷 111-116页

作者： Li Jian Guo Xiaojing Song Danjie Xie Feng Peng Yong School of Computer Beijing University of Posts and Telecommunications Beijing 100876 P. R. China Technical Assessment Research Laboratory China Information Technology Security Evaluation Center Beijing 100085 P R. China

In order to transmit secure messages, a quantum secure direct communication protocol based on extended three-particle GHZ state was presented, in which the extended three-particle GHZ state was used to detect eavesdroppers. In the security analysis, the method of the entropy theory is introduced, and three detection strategies are compared quantitatively by using the constraint between the information eavesdroppers can obtain and the interference introduced. If the eavesdroppers intend to obtain all inforrmtion, the detection rate of the original ＂ping-pong＂ protocol is 50% ; the second protocol used two particles of EPR pair as detection particles is also 50%; while the presented protocol is 58%. At last, the security of the proposed protocol is discussed. The analysis results indicate that the protocol in this paper is more secure than the other two.

关键词： quantum key distffoution "ping-pong" protocol extended three-particle GHZ state eavesdropping detection

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Improved quantum "ping-pong" protocol based on GHZ state and classical XOR operation

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Science China(Physics,Mechanics & Astronomy) 2011年第9期54卷 1612-1618页

作者： LI Jian JIN HaiFei JING Bo State Key Lab of Network and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Department of Computer Science Beijing Institute of Applied Meteorology Beijing 100029 China

In order to transmit the secure message, a deterministic secure quantum direct communication protocol which was called ＂ping-pong＂ protocol was proposed by Bostrrm and Felbinger [Bostrom K, et al. Phys Rev Lett, 2002, 89： 187902]. But the protocol was proved very vulnerable, and can be attacked by an eavesdropper. An improved ＂ping-pong＂ protocol is presented to overcome the problem. The GHZ state particles are used to detect eavesdroppers, and the classical XOR operation which serves as a one-time-pad is used to ensure the security of the protocol. During the security analysis, the method of the entropy theory is introduced, and three detection strategies are compared quantitatively by using the constraint between the information which an eavesdropper can obtain and the interference introduced. If the eavesdropper gets the full information, the detection rate of the original ＂ping-pong＂ protocol is 50%; the detection rate of the second protocol which used two particles of EPR pair as detection particles is also 50%; and the detection rate of the presented protocol is 75%. In the end, the security of the pro-posed protocol is discussed. The analysis results show that the improved ＂ping-pong＂ protocol in this paper is more secure than the other two.

关键词： "ping-pong" protocol XOR operation GHZ state eavesdropping detection protocol security

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