securing data on cloud using ciphertext hybrid encryption with verifiable delegation

computer science and engineering

For keeping data confidential and for achieving access control, data owners opt for attribute based encryption for the data stored on the cloud. Delegation of the decryption task arises when users have limited computing power. As a result of this, attribute based encryption with delegation emerged. But still the previous work is questioned due to various caveats. For example, with delegation, the delegated cipher text could be tampered or replaced by the cloud servers and respond a forged computing result with malicious intent and the eligible users could be cheated by saying that they are ineligible for the purpose of cost saving. Moreover, the access policies may not be flexible enough during the encryption. The data confidentiality , fine-grained access control and the correctness of the delegated computing results are well guaranteed by combining verifiable computation and encrypt-then-mac mechanism.

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