Multi-Authority System on Cloud Using Revocable Data Access Control

Data access control is an effective way to make sure the data security in the cloud. There is not easy to handle the data in cloud storage management because of an untrustworthy server of the cloud. In cloud storage management there is a one Cipher text-Policy Attribute-based Encryption (CP-ABE) technology that is best suited for accessibility of data. By using this technology it provides permission to data owner instruct control on policies of the accessibility. In this cloud computing technology, a private key of every user defines the set of an attribute. Over the each attributes accessibility policies specified by using an encrypted cipher text. If the attributes satisfy the policy of cipher text then decryption done by the user. But in this technology accessibility of cloud storage is difficult to apply because of revocation problem of an attribute. In this paper, we proposed a revocable Cipher text-Policy Attribute-based Encryption (CP-ABE) multi-authority scheme and apply these techniques in the data accessibility system. This scheme used to find out the number of corrupted authority. The main goal is to meet multi-authority in cloud storage system.