File Security System Based on Public Key Infrastructure

Public Key Infrastructure utilize the theory and technology of public key to provide information security service, which is one of important contents in the field of file transmission and management in network environment. The file security system designed well not only secure against itself greatly, but also is used easily, can be expanded and assembled. The paper discussed the principle and process of the file security system from the general architecture, work procedures, the local encryption storage of files, the network security transfer of files ,the share and distribution of files in the security domain. It have solved some security questions such as the network identity authentication, the information integrity and non-repudiation, which provide security protection for the network application.