Decentralized Access Control Technique for Secure Data Stored in Cloud Computing

A new decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. In the proposed scheme, the cloud verifies the authenticity of the user without knowing the user’s identity before storing data. Our scheme also has the added feature of access control in which only valid users are able to decrypt the stored information. The scheme prevents replay attacks and supports creation, modification, and reading data stored in the cloud. The communication, computation and storage overheads are comparable to centralized approaches. The architecture is decentralized, meaning that there can be several KDCs for key management. Paillier algorithm is used for Creation of access policy, file accessing and file restoring proces