A novel lightweight decentralized attribute-based signature scheme for social co-governance

Social co-governance is an effective way to solve public safety incidents such as COVID-19 incident. But the insiders wouldn't share the firsthand information for fear of cyber-violence. Though most of researches paid attention to the data access control and security, less attention focused on the identity privacy. So, in this work, it constructed a lightweight decentralized attribute-based signature scheme with unconditional full anonymity (LDABS-UFA) scheme to protect user's identity privacy security. It confuses the user's private key with fuzzy factors, and prevents user's privacy in the signature from being disclosed. It outsources some complex computing to cloud servers to reduce the user device performance overhead. The security analysis result shows that the scheme is UFA security, unforgeability and non-collusion. Besides, a social co-governance system based on lightweight blackbox-based traceable decentralized attributebased signature (LWBT-DABS) scheme is proposed. By generating fingerprints for the data owner in the signature, regulators can monitor the entire system and prevent malicious user from spreading rumors. And it constructs an accountability mechanism to prevent the abuse of supervisory power. The performance analysis shows that the data signature of our scheme size is constant, and the scheme is feasibility and practicability.