Re-examining the security of blind quantum signature protocols
Ming‐Ming Wang, Xiu‐Bo Chen, Xinxin Niu, Yixian Yang · Physica Scripta · 2012
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.