This paper designed and implemented a set of security network filesystem based on CFS,TCFS and NFS. The system solved the problem of transfering-security and offline-security in NFS successfully.

• 以CFS、TCFS和NFS为基础；设计了一套基于密码学的安全的网络文件系统；成功地解决了NFS的传输安全以及离线安全问题；并给出了具体实现过程.