Multi-Authority Attribute Based Encryption Scheme with Revocation

Attribute Based Encryption (ABE) scheme can achieve information sharing of one-to-many users, without considering the number of users and the users identity. But, the traditional single Attribute Authority (AA) ABE scheme can hardly meet requirements of different agencies in distributed application environment and it is easy to form the system performance bottlenecks. Based on ciphertext-policy ABE scheme, this paper proposes a multi-authority revocable ABE scheme, where the classification manages user attributes, effectively relieving the management burden of single organization. In addition, it can achieve fine grained access control of shared information by adopting tree access strategy and secret sharing scheme, and support system attribute revocation. Finally, we show that the scheme is secure against chosen plaintext attack under the Decisional Bilinear Diffie-Hellman (DBDH) assumption.