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We investigate the fair quantum blind signature scheme proposed by Wang and Wen [Wang T Y and Wen Q Y 2010 Chin.Phys.B 19 060307],which uses the fundamental properties of quantum mechanics and the availability of a trusted arbitrator.However,in this paper,we find that the protocol cannot satisfy the property of non-forgeability even under the condition that the trusted arbitrator is totally credible.Moreover,a simple feasible suggestion for improving the protocol is proposed.
We investigate the fair quantum blind signature scheme proposed by Wang and Wen [Wang TY and Wen QY 2010 Chin. Phys. 19 060307], which uses the fundamental properties of quantum mechanics and the availability of a trusted arbitrator. Host, in this paper , we find that the protocol can not satisfy the property of non-forgeability even under the condition that the trusted arbitrator is totally credible. Moreover, a simple feasible suggestion for improving the protocol is proposed.