Research On Searchable Encryption In Cloud Storage

As cloud computing technology matures, more and more attention has been focused on the applications of cloud storage. Cloud storage applications can not only effectively reduce the cost of the user's data management costs, but also allows users to more easily use the data to improve the flexibility of data use.In cloud storage applications, the security and privacy of users' data is the key factor that affecting the quality of cloud storage services. In order to guarantee the security of users' data, it is common to encrypt users' data, then the data in the form of cipher to upload to cloud server. However, the cipher has no previous features. In order to ensure the availability and security of users' data in cloud storage, we use searchable encryption schemes to store and protect users' data. But in practice, u users need to find and update the stored data frequently, and the keyword index can make the users' operation more flexible. It is necessary to construct a flexible and secure searchable encryption scheme that based on keyword in cloud storage applications.In this paper, we review searchable encryption algorithms that in cloud storage and study the key technologies of searchable encryption. Then, we point out shortcomings for existing searchable encryption schemes, and propose a dynamic multi-keyword searchable encryption scheme to meet users updating and searching encrypted data in cloud storage applications. We have mainly studied on the searchable encryption algorithms in cloud storage. By combining the new dynamic random bloom filter algorithm, a dynamic multi-keyword searchable encryption scheme has been proposed, which is a more suitable for presently cloud storage environment. The main research work is as follows:Firstly, we study the existing searchable encryption schemes, and analyze the demand of the practical searchable encryption in cloud storage. On the basis of bloom filter query algorithm, a dynamic random bloom filter scheme by creating and updating index of keyword is proposed for cloud storage applications. Subsequently, detail scheme and theoretical analysis are presented.Secondly, based on the dynamic random bloom filter algorithm, we propose a searchable encryption algorithm for cloud storage applications. When users update their data, it no longer to rebuild index of the whole, but it is simply to update the index of keywords. And we analyze this scheme.Thirdly, a proto-system for the dynamic multi-keyword searchable encryption scheme is designed. Through experimental results we demonstrate the proposed scheme performs better than some other related schemes.