Comment on "Arbitrated quantum-signature scheme"

Abstract

We investigate the quantum signature scheme proposed by Zeng and Keitel [Phys. Rev. A 65, 042312 (2002)]. It uses Greenberger-Horne-Zeilinger (GHZ) states and the availability of a trusted arbitrator. However, in our opinion the protocol is not clearly operationally defined and several steps are ambiguous. Moreover, we argue that the security statements claimed by the authors are incorrect.

4 pages

References in corpus (4)

• An arbitrated quantum signature scheme
• Optimal Encryption of Quantum Bits
• Comparison of two unknown pure quantum states
• Comparing the states of many quantum systems

Cited by in corpus (7)

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• Security problem on arbitrated quantum signature schemes
• On the "Security analysis and improvements of arbitrated quantum signature schemes"
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• Comment on "An arbitrated quantum signature protocol based on the chained CNOT operations encryption"
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