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arXiv:quant-ph/0509189 · Physical Review A

Reply to “Comment on ‘Quantum key distribution for d -level systems with generalized Bell states’ ”

Vahid Karimipour

Published Dec 20, 2005• 2 citations
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Abstract

In the preceding Comment it has been claimed that an entangled-based quantum key distribution protocol proposed by Zhang, Li, and Gao [Phys. Rev. A 64, 024302 (2001)] and its generalization to $d$-level systems by Karimipour, Bahraminasab, and Bagherinezhad [Phys. Rev. A 65, 052331 (2002)] are insecure against an attack devised by the authors of the Comment. We invalidate the arguments of the Comment and show that the protocols are still secure.

DOI
10.1103/physreva.72.066302

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Reply to Comments on "Quantum Key Distribution for d-level systems for generalized Bell states" [Phys. Rev. A, 052331, (2002)] and "Quantum secret sharing based on a reusable Greenberger-Horne -Zeilinger states as secure carriers" [Phys. Rev. A, 67, 044302, (2003)]"

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We show that the criticisms of two recent comments \\cite{ch1,ch2} on the insecurity of quantum key distributions proposed in \\cite{zhang} and \\cite{v1} and the secret sharing protocol proposed in \\cite{v2} are based on a misconception about the meaning of security and hence are invalid.

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Comment on “Quantum key distribution for d -level systems with generalized Bell states”

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In the paper published in Phys. Rev. A 65, 052331 (2002), an entanglement-based quantum key distribution protocol for $d$-level systems was proposed. However, in this Comment, it is shown that this protocol is insecure for a special attack strategy.

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Recently, Zhang, Li, and Guo have proposed a particular eavesdropping attack [Phys. Rev. A {\bf 63}, 036301 (2001), quant-ph/0009042] which shows that my quantum key distribution protocol based on entanglement swapping [Phys. Rev. A {\bf 61}, 052312 (2000), quant-ph/9911025] is insecure. However, security against this attack can be attained with a simple modification. In addition, a simpler version of the protocol using four qubits is introduced.

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Reply to “Comment on ‘Quantum secret sharing based on reusable Greenberger-Horne- Zeilinger states as secure carriers’ ”

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We show that the criticism of a recent Comment by Gao et al. on the insecurity of the quantum secret sharing protocol [proposed in S. Bagherinezhad and V. Karimipour, Phys. Rev. A 67, 044302 (2003)] is based on a misconception about the meaning of security and hence is invalid.

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Reply to “Comment II on ‘Quantum secret sharing based on reusable Greenberger-Horne-Zeilinger states as secure carriers’ ”

Vahid Karimipour

In the preceding Comment [Jian-Zhong Du, Su-Juan Qin, Qiao-Yan Wen, and Fu-Chen Zhu, Phys. Rev. A 74, 016301 (2006)], it has been shown that in a quantum secret sharing protocol proposed in [S. Bagherinezhad and V. Karimipour, Phys. Rev. A 67, 044302 (2003)], one of the receivers can cheat by splitting the entanglement of the carrier and intercepting the secret, without being detected. In this reply we show that a simple modification of the protocol prevents the receivers from this kind of cheating.

arXiv:quant-ph/0605099•Physical Review A•Jul 21, 2006•3 citations

Reply to “Comment on ‘Quantum dense key distribution’ ”

Ivo Pietro Degiovanni, Ivano Ruo Berchera, Stefania Castelletto +4 more

In this Reply we propose a modified security proof of the quantum dense key distribution protocol, detecting also the eavesdropping attack proposed by W\'ojcik in his Comment [W\'ojcik, Phys. Rev. A 71, 016301 (2005)].

arXiv:quant-ph/0410221•Physical Review A•Jan 28, 2005•12 citations
In the preceding Comment it has been claimed that an entangled-based quantum key distribution protocol proposed by Zhang, Li, and Gao [Phys. Rev. A 64, 024302 (2001)] and its generalization to ddd-level systems by Karimipour, Bahraminasab, and Bagherinezhad [Phys. Rev. A 65, 052331 (2002)] are insecure against an attack devised by the authors of the Comment. We invalidate the arguments of the Comment and show that the protocols are still secure.
In the paper published in Phys. Rev. A 65, 052331 (2002), an entanglement-based quantum key distribution protocol for ddd-level systems was proposed. However, in this Comment, it is shown that this protocol is insecure for a special attack strategy.
In the preceding Comment [Jian-Zhong Du, Su-Juan Qin, Qiao-Yan Wen, and Fu-Chen Zhu, Phys. Rev. A 74, 016301 (2006)], it has been shown that in a quantum secret sharing protocol proposed in [S. Bagherinezhad and V. Karimipour, Phys. Rev. A 67, 044302 (2003)], one of the receivers can cheat by splitting the entanglement of the carrier and intercepting the secret, without being detected. In this reply we show that a simple modification of the protocol prevents the receivers from this kind of cheating.