Date of Publication :10th January 2018

Abstract: Data sharing scheme by using attribute-based to reduce the key escrow issue but also develops the expressiveness of attribute, because of that the resulting scheme is more user-friendly to cloud computing. In this proposed work we are introducing an improved two-party key issuing protocol that can guarantee that neither key authority nor cloud service operator can compromise the whole secret key of a user individually. We introduce the concept of the attribute with weight, being provided to enhance the expression of the attribute, which can not only extend the expression from binary to the arbitrary state but also lighten the complexity of access policy. So that, both storage cost and encryption complexities for a ciphertext are relieved. In our proposed work the modification process is after the data owner sends the secret key to the user, the particular cloud user can view the data which is stored on the cloud server. Once the user used that secret key means the key will be automatically changed for that shared data, this dynamic key will be sent to the data owner also.

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