File Encryption

Encrypting files, some files, not the entire drive, whether they be on a remote share, NAS, your desktop, or any file system.

Solutions: Windows, Linux, compatible OS... Android?

Candidates

• True Crypt - Free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux.

Creates a virtual encrypted disk within a file and mounts it as a real disk.

This isn't for encrypting a selected file or files, where they reside. Instead, you get a volume where you have to move those file to that you want encrypted. That volume, and its entire directory structure including files, are all actually stored in one giant file, like an archive, which is a virtual drive mounted as a file system of its own. Think of virtualbox meets pkzip, sort of.

So long as you only want to access the encrypted drive from a single PC (at a time) then it works pretty well to just create a truecrypt volume inside a normal file hosted on the NAS, and have the PC mount that file as the X: drive.

It looks like you have to choose a fixed size for it though. Dynamic sizing only works if the host filesystem is NTFS, which isn't really an option with a NAS (even if it were using NTS, the network connection would obscure this fact to truecrypt)

source: http://yacf.co.uk/forum/index.php?topic=25147.0

• FreeOTFE on Windows to access LUKS-based encrypted "containers"

research

a NAS encryption solution that does client-side encryption/decryption and still handles multiple-access