Enhanced Privacy of Cloud Storage Data Users by Using Improved Data Access Control Scheme for Multi-Authority Cloud Storage

Cloud computing is one of the emerge technologies. To protect the data and privacy of users the access control methods ensure that authorized users access the data and the system. Cipher text-Policy Attribute-based Encryption (CP-ABE) is the appropriate method for data access control in cloud storage. However, CP-ABE schemes to data access control for cloud storage systems are difficult because of the attribute revocation problem. Specifically, this paper surveys a revocable multi-authority CP-ABE scheme. The attribute revocation method can efficiently achieve both forward security and backward security.