Parallel NFS (pNFS) is a new standard part of NFS Version 4.1 standards. NFSv4.1 that follows request for comments (RFC) 5662 is a minor release of NFSv4. NFSv4.1 does not modify any NFSv4 features and functionalities. This paper describes an architecture for a secure file system based on network-attached storage that guarantees end-to-end encryption for all user data. We describe the design of this system, focusing on the features that allow it to ensure that data is written and read only by authorized users, even in the face of attacks such as network snooping and physically capturing the storage media. In this paper existing system we use Kerberos based pNFS protocol. Many of the practical issues faced in implementing robust Kerberos security in a UNIX environment can be eased by using a Windows Active Directory (AD) system. The existing had some drawback. It not be feasible to provide strong physical security and network protection for all the storage devices. So we propose three authenticated key exchange protocols for parallel network file system (pNFS). It’s not an attribute of the data, but an arrangement between the server and the client, so data can still be accessed via non-pNFS and other file access protocols. pNFS benefits workloads with many small files, or very large files, and is suitable for a range of HPC-type workloads.