Comment on "Arbitrated quantum-signature scheme"

Details Comment on "Arbitrated quantum-signature scheme" Comment on "Arbitrated quantum-signature scheme"

2008-06-05

arxiv.org/abs/0806.0854v1

Phys. Rev. A 77, 046301 (2008)

Physics

Quantum Physics

4 pages

Scientific paper

10.1103/PhysRevA.77.046301

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.

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