Controls on data in the cloud computing environment include the governance policies set in place to make sure that your data can be trusted. The integrity, reliability, and confidentiality of your data must be beyond reproach. And this holds for cloud providers too. In a Cloud Computing the data security achieved by Data Access Control Scheme. Cipher text-Policy Attribute-based Encryption (CP-ABE) is considered as one of the most suitable scheme for data access control in cloud storage. This

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... eme provides data owners more direct control on access policies. However, CP-ABE schemes to data access control for cloud storage systems are difficult because of the attribute revocation problem. In this paper we study and implement a revocable multi-authority CP-ABE scheme. The attribute revocation method can efficiently achieve both forward security and backward security. This survey shows that revocable multi-authority CP-ABE scheme is secure in the random oracle model and is more efficient than previous multi-authority CP-ABE.