We introduce an attack scheme for eavesdropping freely the ping-pong quantum communication protocol proposed by Bostrǒm and Felbinger [Phys. Rev. Left. 89, 187902 （2002）] in a noise channel. The vicious eavesdroppe...We introduce an attack scheme for eavesdropping freely the ping-pong quantum communication protocol proposed by Bostrǒm and Felbinger [Phys. Rev. Left. 89, 187902 （2002）] in a noise channel. The vicious eavesdropper, Eve, intercepts and measures the travel photon transmitted between the sender and the receiver. Then she replaces the quantum signal with a multi-photon signal in the same state, and measures the returned photons with the measuring basis, with which Eve prepares the fake signal except for one photon. This attack increases neither the quantum channel losses nor the error rate in the sampling instances for eavesdropping check. It works for eavesdropping the secret message transmitted with the ping-pong protocol. Finally, we propose a way for improving the security of the ping-pong protocol.展开更多
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 eavesdro...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.展开更多
In order to transmit the secure messages,a deterministic secure quantum direct communication protocol,called the "Ping-pong"protocol was proposed by Bostrm and Felbinger [Phys.Rev.Lett.89,187902(2002) ].But ...In order to transmit the secure messages,a deterministic secure quantum direct communication protocol,called the "Ping-pong"protocol was proposed by Bostrm and Felbinger [Phys.Rev.Lett.89,187902(2002) ].But the protocol was proved to have many vulnerabilities,and can be attacked by eavesdroppers.To overcome the problem,an improved security detection strategy which inserts the | 0〉,| 1〉,|+〉and |-〉particles into the messages as the decoy particles randomly in the"Ping-pong"protocol is presented.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 eavesdroppers can obtain and the interference introduced.Because of the presence of the trap particles |+〉and |-〉,the detection rate will be no less than 25% when Eve attacks the communication.The security analysis result shows that the efficiency of eavesdropping detection in the presented protocol is higher than the other two,so the detection strategy in the protocol can ensure that the "Ping-pong"protocol is more secure.展开更多
In mobile IPv6 networks, the ping-pong type of movement brings about frequent handovers and thus increases signaling burden. This letter proposes a fast seamless handover scheme where the access router keeps the mobil...In mobile IPv6 networks, the ping-pong type of movement brings about frequent handovers and thus increases signaling burden. This letter proposes a fast seamless handover scheme where the access router keeps the mobile node's old reservation till the offline Count Down Timer (CDT) expires in order to reduce handover signaling and delay while the mobile node returns in a very short period of time. Based upon a pois son mobility model, an simple expression for CDT optimization is given out for the scheme to achieve the best cost performance of resource reservation.展开更多
A kind of turbo joint detection scheme based on parallel interference cancellation （PIC） is studied; then, the eigenvalues of iteration matrix is deeply analyzed for studying the ping-pong effects in PIC JD and the ...A kind of turbo joint detection scheme based on parallel interference cancellation （PIC） is studied; then, the eigenvalues of iteration matrix is deeply analyzed for studying the ping-pong effects in PIC JD and the corresponding compensation approach is introduced. Finally, the proposed algorithm is validated through computer simulation in TDD CDMA uplink transmission. The result shows that the ping-pong effects are almost avoided completely in the presence of the compensation scheme, and system performance is greatly improved.展开更多
Computational based cryptography might not guarantee long term security if computational algorithms, computers, and so on are made remarkable progress. Therefore, quantum cryptography with unconditionally security att...Computational based cryptography might not guarantee long term security if computational algorithms, computers, and so on are made remarkable progress. Therefore, quantum cryptography with unconditionally security attracts attention. In this paper, we consider security of a two-way quantum key distribution protocol, so called Ping-Pong protocol. As a result, we introduce not only robustness but also a different information disturbance theorem, which denotes a trade-off relationship between information gain for an eavesdropper and error rate, from the related works for an attack model.展开更多
In this paper, the current situation of China＇ s Ping-pong referees team is studied using the methods such as document literatures and investigation, and the basic situation of the team is analyzed, and also the leve...In this paper, the current situation of China＇ s Ping-pong referees team is studied using the methods such as document literatures and investigation, and the basic situation of the team is analyzed, and also the level of law enforcement and the existing main problems are summarized, so as to explore the new ideas for the construction of the Ping-pong referees team and also provide a basis for China to train excellent Ping-pong referees. Through investigation, it is found that the problems such as the aging structure, poor English, insufficient training, and less judgment chances of the Ping-pong referee team should be practically solved, and also the artistic judgment quality should be improved.展开更多
Sichuan is the strongest province in western China, and Chengdu is the first stop of the Silk Road and the Yangtze River Economic Zone. Qingbaijiang,the inception point of the Chengdu-Europe express railway, is an imp...Sichuan is the strongest province in western China, and Chengdu is the first stop of the Silk Road and the Yangtze River Economic Zone. Qingbaijiang,the inception point of the Chengdu-Europe express railway, is an important source of artifacts from the ancient Sichuan civilization, and Sichuan province, the land of abundance, is the cradle and base of ping-pong. Chengdu has been connected to展开更多
The quantum secure direct communication protocol recently proposed by Cao and Song [Chin. Phys. Left. 23 （2006）290] （i.e., the C-S QSDC protocol） is revisited. A security leak is pointed out. Taking advantage of t...The quantum secure direct communication protocol recently proposed by Cao and Song [Chin. Phys. Left. 23 （2006）290] （i.e., the C-S QSDC protocol） is revisited. A security leak is pointed out. Taking advantage of this leak, an eavesdropper may adopt the intercept-measure-resend strategy to attack the quantum channel such that in the C-S QSDC protocol the secret message can be completely eavesdropped. To fix the leak, the original version of the C-S QSDC protocol is revised. As a consequence, the security is improved and assured at least in the case of an ideal quantum channel.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant No 10604008） and the Beijing Education Committee （Grant No XK100270454）.
文摘We introduce an attack scheme for eavesdropping freely the ping-pong quantum communication protocol proposed by Bostrǒm and Felbinger [Phys. Rev. Left. 89, 187902 （2002）] in a noise channel. The vicious eavesdropper, Eve, intercepts and measures the travel photon transmitted between the sender and the receiver. Then she replaces the quantum signal with a multi-photon signal in the same state, and measures the returned photons with the measuring basis, with which Eve prepares the fake signal except for one photon. This attack increases neither the quantum channel losses nor the error rate in the sampling instances for eavesdropping check. It works for eavesdropping the secret message transmitted with the ping-pong protocol. Finally, we propose a way for improving the security of the ping-pong protocol.
基金Acknowledgements The project was supported by the Specialized Research Found for the Doctoral Program of Higher Education of China under Grant No. 20060013007 the National Natural Science Foundation of Beijing under Caant No. 4092029 and the National Natural Science Foundation of China under Grant No. 61100205, No. 60873001.
文摘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.
基金supported by Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No.20060013007National Natural Science Foundation of Beijing under Grant No.4092029National Natural Science Foundation of China under Grant No.60873001
文摘In order to transmit the secure messages,a deterministic secure quantum direct communication protocol,called the "Ping-pong"protocol was proposed by Bostrm and Felbinger [Phys.Rev.Lett.89,187902(2002) ].But the protocol was proved to have many vulnerabilities,and can be attacked by eavesdroppers.To overcome the problem,an improved security detection strategy which inserts the | 0〉,| 1〉,|+〉and |-〉particles into the messages as the decoy particles randomly in the"Ping-pong"protocol is presented.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 eavesdroppers can obtain and the interference introduced.Because of the presence of the trap particles |+〉and |-〉,the detection rate will be no less than 25% when Eve attacks the communication.The security analysis result shows that the efficiency of eavesdropping detection in the presented protocol is higher than the other two,so the detection strategy in the protocol can ensure that the "Ping-pong"protocol is more secure.
基金Supported by the National Natural Science Foundation of China (No.60202005).
文摘In mobile IPv6 networks, the ping-pong type of movement brings about frequent handovers and thus increases signaling burden. This letter proposes a fast seamless handover scheme where the access router keeps the mobile node's old reservation till the offline Count Down Timer (CDT) expires in order to reduce handover signaling and delay while the mobile node returns in a very short period of time. Based upon a pois son mobility model, an simple expression for CDT optimization is given out for the scheme to achieve the best cost performance of resource reservation.
文摘A kind of turbo joint detection scheme based on parallel interference cancellation （PIC） is studied; then, the eigenvalues of iteration matrix is deeply analyzed for studying the ping-pong effects in PIC JD and the corresponding compensation approach is introduced. Finally, the proposed algorithm is validated through computer simulation in TDD CDMA uplink transmission. The result shows that the ping-pong effects are almost avoided completely in the presence of the compensation scheme, and system performance is greatly improved.
文摘Computational based cryptography might not guarantee long term security if computational algorithms, computers, and so on are made remarkable progress. Therefore, quantum cryptography with unconditionally security attracts attention. In this paper, we consider security of a two-way quantum key distribution protocol, so called Ping-Pong protocol. As a result, we introduce not only robustness but also a different information disturbance theorem, which denotes a trade-off relationship between information gain for an eavesdropper and error rate, from the related works for an attack model.
文摘In this paper, the current situation of China＇ s Ping-pong referees team is studied using the methods such as document literatures and investigation, and the basic situation of the team is analyzed, and also the level of law enforcement and the existing main problems are summarized, so as to explore the new ideas for the construction of the Ping-pong referees team and also provide a basis for China to train excellent Ping-pong referees. Through investigation, it is found that the problems such as the aging structure, poor English, insufficient training, and less judgment chances of the Ping-pong referee team should be practically solved, and also the artistic judgment quality should be improved.
文摘Sichuan is the strongest province in western China, and Chengdu is the first stop of the Silk Road and the Yangtze River Economic Zone. Qingbaijiang,the inception point of the Chengdu-Europe express railway, is an important source of artifacts from the ancient Sichuan civilization, and Sichuan province, the land of abundance, is the cradle and base of ping-pong. Chengdu has been connected to
基金Supported by the National Natural Science Foundation of China under Grant No 10304022, the Science-Technology Fund of Anhui Province for 0utstanding Youth under Grant No 06042087, the General Fund of the Educational Committee of Anhui Province under Grant No 2006KJ260B, the Key Fund of the Ministry of Education of China under Grant No 206063, the Natural Science Foundation of Hubei Province under Grant No 2006ABA354, and the Foundation of the State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics of Chinese Academy of Sciences under Grant No T152615.
文摘The quantum secure direct communication protocol recently proposed by Cao and Song [Chin. Phys. Left. 23 （2006）290] （i.e., the C-S QSDC protocol） is revisited. A security leak is pointed out. Taking advantage of this leak, an eavesdropper may adopt the intercept-measure-resend strategy to attack the quantum channel such that in the C-S QSDC protocol the secret message can be completely eavesdropped. To fix the leak, the original version of the C-S QSDC protocol is revised. As a consequence, the security is improved and assured at least in the case of an ideal quantum channel.
