| The rapid development of smart grid increased a lot of applications such as smart meters and measurement systems.It made the sizes and types of data grow s linearly.The bottleneck of restricting the development of smart grid is the safety storage of massive grid data.Cloud storage can use virtualization technology to integrate the physical resources into a unified storage.It can support the storage of huge amounts of data,and it has the advantage of supporting a large amount of data processing,strong flexibility and high reliability,it also can solve the storage problem of massive grid data.But in the process of using cloud to storage grid data,how to ensure the integrity of the grid data storage is a challenge to the development of smart grid.This paper mainly focuses on the study that how to protect the data integrity of cloud storage.First of all,this paper improves the existing structure of cloud storage and adds the CIM model in the structure of cloud storage.It can ensure the data sharing and data security in the cloud storage.The client collected the data,then standardized CIM model,finally the user encrypted the data and stored in the cloud in the form of cipher text data.Secondly,this paper established the model of data integrity protection to verify the integrity of data in the cloud storage.According to the shortage of the existing method of integrity detection,this paper improves the existing method.The trusted third party uses the RSA algorithm to generate the secret key,and sends it to a specific user of group.The group uses dynamic broadcast encryption technology to broadcast the secret key,then stores the cipher text data into the cloud.It can support the identity of the user privacy.Thirdly,In the process of users,they use the parallelization technology of Map Reduce to sign.The Improved algorithm of data integrity detection can support data sharing in the group.Groups can dynamically add or revoke users,and the signature information modified by the cloud storage dynamically.It reduces the computational cost of users.At the same time,there are two kinds of patterns which is single algorithm of verification and batch algorithm of verification.The batch algorithm of verification improves the efficiency of data integrity verification,then this paper analyses the performance of algorithm.Finally,we set up the environment of Hadoop and HBase in the laboratory,then test the security in the cloud storage and the performance of data integrity verification on the prototype system.The experimental results show that the improved data integrity detection algorithm can effectively detect the power data that stored in the cloud,and the efficiency of the algorithm is higher.The improved scheme of protecting data integrity in this paper can provide effective protection for smart grid data. |
