Quantum multi-proxy strong blind signature based on block blind coding

In practical application, many scenarios need to protect user identity and privacy, and multiple parties are required to participate in transaction audits, but the existing signature schemes are often inefficient and weak blind. Therefore, this paper proposes a new multi-proxy blind signature scheme based on block blind coding. It can not only resist forgery attacks, deny attacks, and intercept retransmission attacks, but also has stronger anonymity and higher efficiency. For instance, we design a securities trading model based on this signature scheme; through the analysis of the safety and efficiency, the scheme features unforgeability and non-deniability, and the efficiency can reach 50%. This signature scheme applies to the transaction or process management, which needs to protect user privacy and multi-party audit during processing, so it has strong practicability.