Research And Implement Of Secure Sharing File System

With the development of computer network technology, more and more applications have been applied to network. As a result, the security of sharing files based on network becomes more and more important. Therefore, it is very meaningful to take action to protect the data information shared in the network from being damaged or stolen.The secure file sharing system is established to protect the sharing file information in network and provide an effective and reliable management plan for sharing file security on Internet.The thesis presents the meaning and development situation of the topic and discusses the problem of the existing sharing file security. Based on the detailed system requirement analysis, we propose an efficient way to solve the problem of sharing file system security. This way could provide the sharing files with the security of storage, being accessed, transmission and being edited. Moreover, we design a framework of the secure file sharing system based on the foundation of C/S pattern and discuss the idea of systematic design, with module divided and designed in details.The kernel of file storage's security in client which is the core module of storage's security is composed of virtual disk module and file filter driver module. The thesis puts a strong emphasis on description of the implementation mechanism of the two modules. The ultimate of the virtual disk module is as follows: mount an image file as a virtual disk. The virtual disk driver accesses e-files on the virtual disk. A special code/decode procedure in the virtual disk driver is used to encrypt files before writing and decrypt files after reading. Thus the secure storage of the information is realized. File filter driver module prevents accessing files in the virtual disk by illegal process through a file filter driver attached on the file system of the Windows OS which can head off requests of accessing the virtual disk device.