Cost-efficient Outsourced Decryption of Attribute Based Encryption Schemes for Both Users and Cloud Server in Green Cloud Computing

In order to reduce a user’s decryption cost and protect the private information from being leaked, the green cloud networks helps to reduce the user’s cost. But this method is not efficient for the cloud server in the green cloud networks. So, we have proposed account recyclable utilization of resources for the cloud server, which put forward a new and secure approach to reduce total overhead of the cloud server. Another approach we have proposed in our schemes, outsourcing the decryption of the attribute based encryption (ABE) scheme to the cloud server.

 However, the cloud server needs to repeat the outsourced decryption service of the same ciphertext for distinct users satisfying the same access policy. So, Compared with the existing ABE-OD schemes, our total overhead of the cloud server is independent of the number of the users who satisfy an access policy and request the outsourcing decryption service. Finally, we extend our approach to a RCCA-secure ABE-OD scheme.

Keywords: Green Cloud Computing, Attribute-Based Encryption Outsourced Decryption, Bilinear Maps.