Research and Implement of an Encrypted File System Used to NAS

Data security has become an increasingly important factor in routine work with the development of applications, and users trend to obtain high security with maximum comfort. In this article a cryptographic file system called NAS_CFS used for NAS is designed. NAS_CFS has some characteristics as below: adding encryption function to file-system layer allows users to encrypt data transparently, obtaining high security by key management based on session ID and user ID, attachment and timeouts mechanisms, and NAS_CFS is an in-kernel file system of high performance using stackable mechanism.