A Secure Circuit CP-ABE with Time-Specified Attribute Scheme in Cloud Computing

Cloud Computing

In the cloud environment, data owners could use attribute-based encryption to encrypt the stored data for accomplishing access control and data security. For the purpose of cost saving, cloud server may fraud the eligible users by responding them that they are unworthy. Since policy for general circuits are used to achieve the strongest form of access control, construction to design circuit cipher text-policy attribute-based encryption with time-specified attribute scheme has been developed. In this scheme, each cipher text is labeled with some attribute and a time interval while private key is associated with time instant. The cipher text can only be decrypted if both time instant is in allowed time interval and the attributes related with the cipher text satisfy the key’s access structure. This system is varied with verifiable computation, data confidentiality, correctness of the delegated computing results are well assured at the same time with feasibility as well as efficiency.

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