Reexamining the security of fair quantum blind signature schemes

Xiangfu Zou, Daowen Qiu

Jiahao Zhang, Nian Xue, Hao Wang +4 more

Tian‐Yin Wang, Wen Qiao-yan

We present a new fair blind signature scheme based on the fundamental properties of quantum mechanics. In addition, we analyse the security of this scheme, and show that it is not possible to forge valid blind signatures. Moreover, comparisons between this scheme and public key blind signature schemes are also discussed.

Ming‐Ming Wang, Xiu‐Bo Chen, Xinxin Niu +1 more

Recently, blind quantum signature (BQS) protocols have been proposed with the help of a third-party verifier. However, our research shows that some of the BQS protocols are unable to complete the blind signature task fairly if the verifier is dishonest. Indeed, these protocols can be viewed as variants of the classical digital signature scheme of symmetric-key cryptography. If nobody is trusted in such protocols, digital signature cannot be implemented since disagreements cannot be solved fairly.

Hui-Juan Zuo

Jie Cao, Xiangjun Xin, Chaoyang Li +1 more