SECURE SYSTEMATIC BLOCKCHAIN-BASED ACCESS CONTROL SCHEME WITH MULTIPLE ATTRIBUTE AUTHORITIES

Ciphertext-policy attribute-based encryption (CP-ABE) used for secure data sharing. In existing system all user attributes are managed by a single central authority, it is easy to occur a single point of failure. In this work propose a Blockchain-based Multi-authority Access Control scheme called BMAC for sharing data securely. In addition,to establish a trust among multiple authorities and make a smart contract to compute tokens for attributes managed across multiple management domains, it reduces communication and computation overhead on the user side. The blockchain helps to record the access control process in a secure manner.