Cryptanalysis and Improvement of Some Quantum Proxy Blind Signature Schemes

Recently, two novel quantum proxy blind signature schemes are proposed by Zeng et al. and Yang et al., respectively. Their schemes have made a great contribution to the development of quantum proxy blind signature (QPBS). However, we find that there exist some security loopholes which have been neglected by them, i.e., the receiver can forge the signature in Zeng et al.’s scheme and the unreasonable assumption about arbitrator exists in Yang et al.’s scheme, etc. In order to overcome these problems, some improved ideas are proposed. Moreover, we give the further discussions of QPBS in this paper. Finally, we summarize some reasonable assumptions in order to satisfy the security properties of QPBS.