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

Abstract

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.