Supervisory Scheme for Blockchain Privacy Protection Technique Based on Group Signature

Supervisory Scheme for Blockchain Privacy Protection Technique Based on Group Signature

연구 분야: Cryptography

학회: ACM ICEA '21: Proceedings of the 2021 ACM International Conference on Intelligent Computing and its Emerging Applications

As research on blockchain deepens, privacy protection technologies of blockchain continue to develop. However, the use of these privacy protection technologies may cause supervisory problems since tracing and censoring malicious users and their misbehaviors become difficult. In order to solve the supervisory problems, we propose a supervisory scheme based on the Linkable Spontaneous Anonymous Group Signature (LSAG) schemes. In this paper, we first proposed the overall supervisory scheme based on LSAG to achieve effective tracing of blockchain users. To prevent tracing power abuses, we then redesigned the key generation algorithm and its corresponding negotiative decryption algorithm in the scheme to allow decentralized traceability. Only when all supervisory nodes agree can a transaction be decrypted and linked to its sender. Experiments show that our scheme can effectively realize transaction accountability and also prevent the abuse of this supervisory power.