In this paper, we describe the implementation and evaluation of the distributed secure file system based on FUSE. A tremendous amount of content is now saved on file servers. File servers and network storage can also easily be installed in small organizations by using operating systems such as Linux. However, the storage capacity of PCs that are generally used is also increasing due to low-priced hard disks. The surplus disk capacity of these PCs is also increasing rapidly especially for work and research. Therefore, we need to use these surplus disks effectively by using distributed preservation of files. Furthermore, administrators may also inadvertently contribute to information leakage and falsification. Therefore, it has recently become necessary to ensure not only user authentication and communication pathways but security within the medium used for storage. Therefore, we implemented and evaluated a system we called JIGFS, which accomplishes secure file management based on a public key for all users. It also distributes and saves file using common PCs, and efficiently uses surplus disk capacity and the communication band. As it is implemented using Filesystem in USErspace (FUSE), users can use it like a conventional file system.