Research On Secure And Distributed Cloud Storage From The Attribute-Based Encryption

In recent years, cloud computing has become one of the popular technologies. Cloud computing is the model of combining the network with the Internet and provides the calculation capability according to the user’s payment on demand. That is, all software or hardware can be quickly and conveniently used by the user as water or electricity in our life. Cloud storage is an extension concept of cloud computing, in which the storage task is moved from local servers, such as personal computers, mobile phones or other storage devices and so on, to the remote servers and this can save the local storage space.When the data is stored in cloud storage servers, its security, robustness and privacy preserving have become very important and sensitive problems. This paper aims to study these problems. Our main contributions are summarized as follows.1. First of all, we proposed one Secure and Distributed Cloud Storage Model (SD-CouldSM), in which the data can be monitored or managed by a center, in the private cloud environment. In this model, we used distributed erasure code to improve the robustness of the model. The ciphertexts are encoded and stored in cloud storage servers. Furthermore, it does require a trusted authority to monitoring and manage all the data while we adopt a multi-authority mode to build our model.2. Secondly, we proposed one Fully Distributed Multi-authority Cloud Storage Model (FDCloudSM) to support hybrid cloud environment. Based on the attribute-based encryption technology, this model does not need the trusted authority and all servers runs independently. The security in our model is en-hanced since all phases work distributedly and there are not trusted authority and this model can be used in hybrid cloud environment.3. Finally, we proposed one model to support the privacy preserving of the data, the identity and the acess structure. This model not only protects the security of data but also avoids the identity information of encryptors and decryptors and the access structure be revealed. Futhermore, our model is safe, robust and privacy preserving cloud storage model.