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An Efficient Ciphertext Policy-Attribute Based Encryption for Big Data Access Control in Cloud Computing

Big data refer to the variety of the massive amount and the velocity of the data. The traditional databases are not suitable to store the big data because of huge volume. The cloud computing is a best and optimal choice to store and process the big data. However, there is an important issue to be addressed before storing the big data into the cloud that is maintaining the privacy and access control, in which the data must encrypt and restrict the unauthorized user access by providing effective access control. Ciphertext Policy-Attribute Based Encryption (CP-ABE) is a promising technique to provide both encryption and effective access control. The existing CP-ABE schemes are not apt for big data in cloud since it creates heavy computation overhead. In this paper, we propose an efficient ciphertext policy attribute based encryption scheme with less computation overhead in the encryption process by providing the short ciphertext and reducing the decryption time by minimizing the pairing operations required. Through the security analysis we demonstrate that our design is secure under chosen-plaintext attack and user collusion attack. The performance analysis proves that our scheme is efficient when compared with existing schemes.