National Laboratory for Modern Communications

Chengdu, China

National Laboratory for Modern Communications

Chengdu, China
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Gao F.,Beijing University of Posts and Telecommunications | Qin S.-J.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
Optics Communications | Year: 2010

We analyze the security of multiparty controlled quantum secure direct communication using Greenberger-Horne-Zeilinger (GHZ) state. It is shown that the receiver, using a special property of GHZ state, can illegally obtain 33.3% of the sender's secret without any controller's permission. The attack strategy is demonstrated in detail and an improvement of this protocol is discussed. The idea of this attack might be instructive for the cryptanalysis of quantum cryptographic protocols. © 2009 Elsevier B.V. All rights reserved.


Sun Y.,Beijing University of Posts and Telecommunications | Sun Y.,Xidian University | Wen Q.-y.,Beijing University of Posts and Telecommunications | Zhu F.-c.,National Laboratory for Modern Communications
Optics Communications | Year: 2010

The security of the multiparty quantum secret sharing protocol presented by Zhang [Z.J. Zhang, Physica A, 361 (2006) 233] is analyzed. It is shown that this protocol is vulnerable to the insider attack since eavesdropping detection is performed only when all states arrive at the last agent. We propose an attack strategy and give an improved version of the original protocol. The improved protocol is robust and has the same traits with the original one. © 2009 Elsevier B.V. All rights reserved.


Qin S.-J.,Beijing University of Posts and Telecommunications | Gao F.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
Optics Communications | Year: 2010

The security of quantum secure direct communication by entangled qutrits and entanglement swapping [Y.B. Zhan et al., Opt. Commun. 282 (2009) 4633] is analyzed. It is shown that an eavesdropper can obtain all the secret without being found by a simple intercept-and-resend attack. Finally, a possible improvement to resist this attack is proposed. © 2009 Elsevier B.V. All rights reserved.


Wang T.-Y.,Beijing University of Posts and Telecommunications | Wang T.-Y.,Luoyang Normal University | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
Optics Communications | Year: 2011

The security of multiparty quantum secret sharing with Bell states and Bell measurements [R.H. Shi et al., Opt. Commun. 283 (2010) 2476] is analyzed. It is shown that the first agent and the last one can gain access to the dealer's secret if they collaborate in this protocol. Therefore, this protocol does not satisfy the security requirement of quantum secret sharing. © 2010 Elsevier B.V. All rights reserved.


Huang W.,Beijing University of Posts and Telecommunications | Guo F.-Z.,Beijing University of Posts and Telecommunications | Huang Z.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
Optics Communications | Year: 2011

The research on decoherence-free subspace has both theoretical and practical significance. DFS is a subspace of quantum system states which is robust against a specific form of decoherence. The method of constructing DFS based algebra, which is different from the way based on the special Bell states, is introduced. Then a three-particle QKD protocol against collective-bit flipping noise is presented according to this method. Finally, we make a security analysis of our protocol. © 2010 Elsevier B.V. All rights reserved.


Qin S.-J.,Beijing University of Posts and Telecommunications | Gao F.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
Communications in Theoretical Physics | Year: 2010

A quantum secure direct communication protocol over a collective rotating channel is proposed. The protocol encodes logical bits in noiseless subspaces, and so it can function over a quantum channel subjected to an arbitrary degree of collective rotating noise. Although entangled states are used, both the sender and receiver are only required to perform single-particle product measurement or Pauli operations. The protocol is feasible with present-day technique. © 2010 Chinese Physical Society and IOP Publishing Ltd.


Wang T.-Y.,Beijing University of Posts and Telecommunications | Wang T.-Y.,Luoyang Normal University | Wang T.-Y.,University of Chinese Academy of Sciences | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
International Journal of Quantum Information | Year: 2011

We present a new multiparty controlled quantum secure direct communication protocol with phase encryption, in which the sender's secret message can only be recovered by the receiver under the permission of all the controllers. The security of this scheme is based on the basic principles of quantum mechanics and the secret order of encoding photons. © 2011 World Scientific Publishing Company.


Wang T.-Y.,Beijing University of Posts and Telecommunications | Wang T.-Y.,Luoyang Normal University | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
Journal of Physics B: Atomic, Molecular and Optical Physics | Year: 2010

We present a new information-theoretically secure protocol for the anonymous transmission of quantum information. Different from the pioneering works, we use single photons to construct anonymous entanglement instead of multi-partite entangled states in this protocol, and therefore we reduce the complexity of physical implementation in practice. © 2010 IOP Publishing Ltd.


Guo F.-Z.,Beijing University of Posts and Telecommunications | Gao F.,Beijing University of Posts and Telecommunications | Wen Q.-Y.,Beijing University of Posts and Telecommunications | Zhu F.-C.,National Laboratory for Modern Communications
International Journal of Quantum Information | Year: 2010

A two-step channel-encrypting quantum key distribution protocol is proposed. Using the previously shared EPR pairs as the quantum key, two bits of classical key can be established via one information carrier EPR state on average. In theory, the efficiency of this protocol reaches 100%, and there is no need to consume any entangled states including both the quantum key and the information carriers in ideal condition. The protocol can resist the particular attack that is fatal to other some channel-encrypting schemes. Principally, we prove the security against the most general individual attack of this protocol. Entanglement collapse in practical situation, as well as the realistic implementation of this protocol is also discussed. © 2010 World Scientific Publishing Company.


Guo F.Z.,Beijing University of Posts and Telecommunications | Qin S.J.,Beijing University of Posts and Telecommunications | Gao F.,Beijing University of Posts and Telecommunications | Lin S.,Beijing University of Posts and Telecommunications | And 2 more authors.
European Physical Journal D | Year: 2010

A kind of multiparty quantum secret sharing (MQSS) schemes based on entanglement swapping is analyzed and an effective attack is proposed. Some unauthorized agent groups can recover the secret from the dealer with the help of this special attack. It is shown that entanglement swapping not only makes the MQSS protocols feasible but also brings a fatal drawback to them. Furthermore, a possible improvement on such protocols is proposed, which makes them secure against the proposed attack. © 2009 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.

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