Abstract
An efficient quantum multi-proxy signature scheme was proposed recently, in which the original signatory Alice distributed her authority to several proxy signatories, and then each proxy signatory can sign the message for her alone. In this work, we give a cryptanalysis on this scheme and then point out an unnoticed problem that the proxy signatory must send the signed message to the verifier when he signs it, which is in conflict with the requirement of digital signatures. Furthermore, this problem will give a good chance for an unreliable proxy signatory to deny his signature on the message. Finally, an improved version is presented, which is more economical and practical with current technology compared with the original scheme.
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Acknowledgements
We are grateful to the anonymous referees for helpful comments on revision. This work was partly supported by the National Natural Science Foundation of China (Grant Nos. 61602232, 61572246, 61902166), the Program for Science & Technology Innovation Research Team in Universities of Henan Province (Grant No. 18IRTSTHN014) and the Project for Teaching Reform and Practice Research of High Education in Henan Province (Grant No. 2019SJGLX094Y).
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Wang, TY., Wang, XX., Cai, XQ. et al. Analysis of efficient quantum multi-proxy signature. Quantum Inf Process 19, 241 (2020). https://doi.org/10.1007/s11128-020-02744-z
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DOI: https://doi.org/10.1007/s11128-020-02744-z