Upgraded Secrecy of Cloud Storage Data Users Using Improved Data Access Control Strategy for Multi-Authority Cloud Storage

Cloud computing is one of the emerge technologies. To protect the data and Secrecy of users the access control strategy ensures that authorized users can access the data and the system. Cipher text-Policy Attribute-based Encryption (CP-ABE) is a method for data access control in cloud storage. However, CP-ABE schemes to data access control for cloud storage systems are difficult because of 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.