Research And Implemetation On Cloud Storage Data Secure Sharing Mechanism

With the rapid development of science and technology, the system structure and management mode of the traditional storage system has been unable to satisfy people’s need for storage. Cloud storage is a specialized centralized data storage system that provides reliable storage service for cloud computing platform through network. The service includes storage device management, volume management, file management, client authentication and access, security controlling and performance monitoring, backup and disaster recovery etc. Cloud computing technology is getting much more mature, it makes the cloud storage service, a storage service based on cloud computing, becoming a research hotspot. Netdisk, as a form of cloud storage service, provides convenient and fast personal cloud storage service for users. However, most of Netdisks have security risks which keep it in low effective utilization rate. How to protect the security of the cloud data is always the important factors which hinder the development of the cloud storage.First, the Netdisk API is analyzed in this thesis. Then the techniques of software reverse-engineering, bypassing user’s login and hijacking data were presented for analysising one closed source cloud storage service software. To obtain user’s sharing data, many software tools and code techniques such as reflective DLL injection were used. Through the attack analysis, we would find that the cloud storage data sharing mechanism has the potential of data leakage.Second, according to the data security storage in the Netdisk, by analyzing several critical interaction process in the cloud model, a design of open source Netdisk is put up. The process of uploading, downloading, managing and data-sharing interaction is described in detail. Then the interactive strategy was designed in detail. Besides, the thesis presents the implementation of uploading authorization, downloading authorization and management authorization. The development of Netdisk is mainly using python and Django. Due to the open source model, the Git technology is required to manage the program. The new Netdisk can keep the data security in higher level.