RTTAC-An Access Control Model Based on Blockchain and Role-Trusted Transfer

Aiming to address the data security issues in data sharing, current approaches such as RBAC, ABAC, and blockchain-based data sharing platforms suffer from problems like role redundancy, role abuse, complex authorization, and data user privacy leakage. In response, a role-based trusted transfer access control model based on trust and attributes is proposed. This model is built upon Attribute-Based Access Control (ABAC) while integrating Role-Based Access Control (RBAC). Users obtain roles based on their attributes and trust levels, and roles determine access permissions based on trust level and defined policies, and then determine the transferability of roles, at the same time, the transfer of roles is limited by trust levels. Encryption techniques and off-chain storage systems are utilized to protect data privacy and integrity, thereby alleviating the storage pressure on the blockchain. Finally, the performance and effectiveness of the proposed model were evaluated through experimental analysis, demonstrating its capability to achieve trustworthy role transfer and enhance the security and privacy of on-chain sharing schemes.