Research And Implementation Of Ciphertext Search System Based On Access Control

With the rapid development of cloud storage technology,technologies of cloud are becoming more and more successful,and the application has become increasingly widespread.In recent years,more and more sensitive information and data stored on the cloud,once the sensitive information and data uploaded to the cloud,the user will be largely lost the ability to control these data.In addition,cloud service providers are not entirely truthful,cloud storage brings us a lot of convenience,but it is very risk to storing the data in the cloud.Data privacy protection in cloud storage has already become the focus of research.The idea of this paper is to solve the privacy protection of the data stored in the cloud.Firstly,a high-grained relatively,simple access control scheme is proposed,and to some extent,the problem of off-line authorization is resolved.Secondly,to solve the low efficiency of ciphertext search,a multi-keyword ranked ciphertext search algorithm for dynamic data is proposed,the speed and accuracy of search are improved.Work has been done is as follows:(1)Ciphertext search system based access control carried out a detail ed study and design.This system consists of two modules:the access cont rol module and ciphertext search module.First of all,the rule of logic of access control is studied and designed,including applying for the right of authorization,the recovery of authorization and so on.Secondly,the ciphertext search module' business logic is studied and designed,including document preprocessing and similarities calculation.(2)Ciphertext search system based on access control is realized by coding.This system is mainly achieved by using the open-source Java Web framework SSH and Luecene.The access control module is according to some global identifier,so that confirming the right of authorization,the recovery of authorization and the other operation'execution.The cipertext search system is based on Luecene and IK Analyzer.(3)Ciphertext search system based on access control is tested in a lot of situation.Test is divided into two parts.The first part is to test the major operation of access control,such as applying for the right of authorization and so on.The second part is that there are a different number of documents on the cloud.Then test the speed and accuracy are tested in the same search condition.In this paper,the process of design and realization of ciphertext search system based access control for data stored on the cloud are as followed:Firstly,the data privacy is protected by controlling the access.Secondly,the ciphertext search helps users to find the data they needed more quickly,more safely and more accurately.