PRIVACY AND OWNERSHIP PROTECTION OF OUTSOURCED CLOUD DATA

Computer Engineering.

Cloud computing is emerging technology for data storage .The user can store and share the documents using the cloud storage. Hence data security and ownership are critical concerns in cloud computing . It is common nowadays for data owners to outsource their data to the cloud. Since the cloud cannot be fully trusted, the outsourced data should be encrypted .Attribute based encryption (ABE) schema is used. But standard ABE scheme has large cipher text size and high decryption cost, and this problem is especially for resource limited devices such as mobile devices. So we design an ABE scheme for a secure cloud storage service By allowing a third party to achieve a data privacy, integrity.aslo asymmetric algorithms (RSA, AES, and Deffie hellman) are applied to a cloud computing model to ensure the data security. Proposed system reduces the ciphertext size and decryption time using RCCA standard,also prove ownership of data in cloud by using Tag generation algorithm and hash algorihm.

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