Multi-authority scheme based CP-ABE with attribute revocation for cloud data storage

Security of the outsourced data has become the core problem of cloud computing. Many security models have been proposed, among which, CP-ABE has gained popularity in this research area. The Ciphertext-Policy Attribute Based Encryption (CP-ABE) is considered as a propitious tool for fine grained data access in the cloud storage system. The existing CP-ABE scheme with only one authority does not solve the trust issues as well as attribute revocation problem. Although many multi-authority CP-ABE schemes have been proposed and solved the trust problem to some extent but failed to provide efficient attribute revocation and solution for system failure. This paper proposes a multi-authority scheme which can solve the trust issues, attribute revocation problem, and system failure.