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Link to official website; move security document

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Jakob Unterwurzacher 2015-12-20 18:25:10 +01:00
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Documentation/SECURITY.md
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GoCryptFS Security
==================
Master Key Storage
------------------
The master key is used to perform content and file name encryption.
It is stored in `gocryptfs.conf`, encrypted with AES-256-GCM using the
Key Encryption Key (KEK).
The KEK is generated from the user password using `scrypt`.
![](https://rawgit.com/rfjakob/gocryptfs/master/Documentation/master-key.svg)
File Contents
-------------
All file contents are encrypted using AES-256-GCM (Galois/Counter Mode).
Files are segmented into 4KB blocks. Each block gets a fresh random
128 bit IV each time it is modified. A 128-bit authentication tag (GHASH)
protects each block from modifications.
Each file has a header containing a random 128-bit file ID. The
file ID and the block number are mixed into the GHASH as
*additional authenticated data*. The prevents blocks from being copied
between or within files.
![](https://rawgit.com/rfjakob/gocryptfs/master/Documentation/file-content-encryption.svg)
To support sparse files, all-zero blocks are accepted and passed through
unchanged.
File Names
----------
Every directory gets a 128-bit directory IV that is stored in each
directory as `gocryptfs.diriv`.
File names are encrypted using AES-256-EME (ECB-Mix-ECB wide-block encryption,
see https://github.com/rfjakob/eme for details) with the directory IV
as initialization vector. EME fixes the prefix leak that occours with CBC
encryption.
![](https://rawgit.com/rfjakob/gocryptfs/master/Documentation/file-name-encryption.svg)
The Base64 encoding limits the usable filename length to 176 characters.
This page has been moved to https://nuetzlich.net/gocryptfs/security/ .

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README.md
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![gocryptfs](Documentation/logo.svg.png) [![Build Status](https://travis-ci.org/rfjakob/gocryptfs.svg?branch=master)](https://travis-ci.org/rfjakob/gocryptfs) ![Release Status](https://img.shields.io/badge/status-beta-yellow.svg?style=flat)
==============
An encrypted overlay filesystem written in Go.
Official website: https://nuetzlich.net/gocryptfs
gocryptfs is built on top the excellent
[go-fuse](https://github.com/hanwen/go-fuse) FUSE library and its
@ -9,7 +10,7 @@ LoopbackFileSystem API.
This project was inspired by EncFS and strives to fix its security
issues while providing good performance.
For details on the security of gocryptfs see the
[SECURITY.md](Documentation/SECURITY.md) design document.
[Security](https://nuetzlich.net/gocryptfs/security/) design document.
Current Status
--------------