Research on attribute-based encryption (ABE) in blockchain privacy and security focuses on enabling fine-grained access control over encrypted data in decentralized networks. By leveraging ABE, blockchain systems can restrict data access based on user attributes, roles, or policies, ensuring that only authorized participants can decrypt sensitive information. This approach is particularly useful in applications such as healthcare, supply chain management, and IoT, where confidentiality and selective disclosure are critical. Studies explore the integration of ABE with smart contracts, consensus mechanisms, and decentralized storage to enhance data security, enforce privacy policies, and support compliance with regulatory requirements. Overall, attribute-based encryption strengthens blockchain ecosystems by combining cryptographic privacy with flexible and secure access control.