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Circuit Ciphertext‐Policy Attribute‐Based Hybrid Encryption with Verifiable Delegation in Cloud Computing
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  • Circuit Ciphertext‐Policy Attribute‐Based Hybrid Encryption with Verifiable Delegation in Cloud Computing

jCircuit Ciphertext‐Policy Attribute‐Based Hybrid Encryption Verifiable Delegation in Cloud Computing

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Circuit Ciphertext Policy Attribute Based Hybrid Encryption with Verifiable Delegation in Cloud Computing

In the cloud, for achieving the data confidentiality and access control, the data owners adopt the attribute-based encryption method to encrypt the stored data. Users with the limited computing power are more likely to delegate the mask of the decryption task to the cloud servers to reduce the computing cost.

As result, attribute-based encryption with delegation emerges. During the delegation, the cloud servers may tamper or replace the delegated cipher text and respond to the forged computing result with malicious intent.

For the purpose of cost saving, they might also cheat the eligible users by responding them that they are ineligible. During the encryption the access policies are not flexible enough. Since policy for general circuits enables to achieve the strongest form of access control, a construction for realizing circuit cipher text-policy attribute-based hybrid encryption with verifiable delegation has been considered in the proposed system.Circuit Ciphertext Policy Attribute Based Hybrid Encryption with Verifiable Delegation

Combination with verifiable computation and encrypt-then-Mac mechanism, the data confidentiality, the fine-grained access control and the correctness of the delegated computing results are well guaranteed at the same time in the proposed system. Besides, the proposed system also achieves the security against chosen-plaintext attacks under the k-multilinear Decisional Diffie-Hellman assumption. Moreover, an extensive simulation campaign confirms the feasibility and efficiency of the proposed system.

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