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In computing, '''Self-certifying File System''' ('''SFS''') is a global and decentralized, [[distributed file system]] for [[Unix-like]] operating systems, while also providing transparent [[encryption]] of communications as well as [[authentication]]. It aims to be the universal distributed file system by providing uniform access to any available server, however, the usefulness of SFS is limited by the low deployment of SFS clients. It was developed in the June 2000 doctoral thesis of [[David Mazières]].

== Implementation ==
The SFS [[client (computing)|client]] [[daemon (computer software)|daemon]] implements the Sun's [[Network File System (protocol)|Network File System]] (NFS) protocol for communicating with the [[operating system]], and thus can work on any operating system that supports NFS, including [[Microsoft Windows|Windows]]. The client manages connections to remote file systems as necessary, acting as a kind of protocol translation layer. The SFS server works similarly to other distributed file system servers, by exposing an existing [[disk file system]] over the network, over the specific SFS protocol. On [[Unix-like]] systems, SFS file systems can usually be found at <tt>/sfs/hostname:hostID</tt>. When an SFS file system is first accessed through this path, a connection to the server is made and the directory is created ("automounted").

== Differences ==
The primary motivation behind the file system is to address the shortcomings of [[wikt:hardwired|hardwired]], administratively configured distributed file systems in larger organizations, and various remote file transfer protocols. It is designed to operate securely between separate [[administrative realm]]s. For example, with SFS, one could store all their files on a single remote server, and access the same files securely and transparently from any location as if they were stored locally, without any special privileges or administrative cooperation (other than running the SFS client daemon). Available file systems will be found at the same path regardless of physical location, and are implicitly authenticated by their path names — as they include the [[public-key fingerprint]] of the server (hence why it is called "self-certifying").

In addition to the new perspective, SFS also addresses some commonly raised limitations of other distributed file systems. For example, NFS and [[Server Message Block|SMB]] clients have to rely on the server for file system security policies, and NFS servers have to rely on the client computer for authentication. This often complicates security, as one compromised computer could breach the security of the entire organization. The NFS and SMB protocols also do not by themselves provide [[confidentiality]] (encryption) or [[tamper resistance]] from other computers on the network, without encapsulation layers such as [[IPsec]].

Unlike [[Coda (file system)|Coda]] and [[Andrew File System|AFS]], SFS does not provide local [[Cache (computing)|caching]] of remote files and thus is more dependent on network reliability, [[latency (engineering)|latency]] and [[Bandwidth (computing)|bandwidth]].

== See also ==
* [[Clustered file system]]
* [[Network File System (protocol)]]
* [[Coda (file system)]]
* [[Andrew File System]]

==Source==

[http://wikipedia.org/ http://wikipedia.org/]
[[Category:Data storage]]
[[Category:Technology]]

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Admin: Created page with "In computing, '''Self-certifying File System''' ('''SFS''') is a global and decentralized, distributed file system for Unix-like operating systems, while also providin..."