A Blockchain and Attribute-based Encryption Scheme for Hazardous Materials Circulation Data Sharing
Xuewei Li, Jialin Ma, Ashim Khadka · International Journal of Knowledge and Innovation Studies · 2024
The regulatory system for hazardous materials is complex, with poor inter-departmental communication and low levels of data sharing, making effective regulation challenging.Blockchain technology, known for its decentralization, traceability, and secure and trustworthy information, is widely applied in data sharing.Concurrently, attribute-based encryption (ABE), a novel encryption technique, offers high security and fine-grained access control, providing technical support for secure data access and privacy protection.However, existing attribute encryption algorithms do not consider the hierarchical relationship of access structures among data files during data sharing.Moreover, the immutable nature of blockchain means that access policies stored on it cannot be altered, leading to a lack of flexibility in data sharing.To address these issues, this paper proposes a blockchain and attribute-based dynamic layered access scheme for hazardous materials circulation data sharing.By constructing a Linear Secret-Sharing Scheme (LSSS) matrix, layered access control is achieved, allowing data decryption related to the matching parts of a user's attributes with the access structure.Additionally, through the design of a policy update algorithm, the blockchain structure is organized into transaction blocks and policy blocks, storing the encrypted symmetric keys separately to enable dynamic updates of access policies.Security analysis and experimental comparisons demonstrate the scheme's effectiveness and security in hazardous materials circulation data sharing.