Data Security Storage And Multi-Replica Associated Deletion Mechanism In Cloud

The rapid development of network information technology promotes the level of the social information gradually increasing. The renewal of the web technology and the popularity of intelligent terminals and mobile platform allow the public to share and build the Internet information anytime and anywhere. More and more users store or share personal data through the network, which leads to the explosive growth of global data storage. In order to solve the storage of mass data, cloud storage technology is proposed. Due to the good expansibility, high fault tolerance and cost effectiveness, cloud storage technology has become a hot topic of academic circles and industrial fields.. However, when the data are stored in the cloud service provider by data owner, the ownership is divorced from the owner's control. There is grave concern for the existence of security risks, such as data disclosure, hacking and other hidden dangers. On the other hand, cloud storage service providers or authorized users may backup and transfer the electronic files to generate many multiple replicas. And if lack of effective associated deletion mechanism, it will not only waste the storage space greatly, but also easily cause many problems, like the abuse of the data, privacy disclosure and so on. Or even endanger national security.According to the above problem, the main research work in this paper is:Firstly, in order to solve the problem that the electronic file cannot control its storage time or authorized period during storing or sharing, this paper introduces a new file structure, and proposes a mechanism for data storage and security protection. The core content is to design a new data encapsulation scheme, which combines digital signature, symmetric encryption and attribute based encryption to achieve the access control of electronic documents. At the same time,there is a constraint on the storage period and authorized period, and it will delete the electronic file when exceeding the storage period. At last, we verify the feasibility of this scheme by the simulation experiment., analyze the security and function simultaneously. The analysis proves that this scheme is effective to solve the problem of privacy protection for the electronic files stored in the cloud environment.Secondly, in order to solve the problem that is the multiple replicas generated during the storage and sharing period can't be associate deleted and bring a risks of security. This paper proposed a multi-replica correlation model and delete feedback mechanism based on secure storage and protection mechanism of data. The main core is to devise a multi-replica correlation model and use the replica catalog to achieve the associated management of the multi-replica. Then the working principle and the concrete structure of the multi-replica association are described in detail. At last,the feasibility of the scheme is verified by the simulation experiment, which proves the practicability of the scheme.