سلام الله عليكم
https://launchpad.net/ecryptfs
http://www.arg0.net/encfs
http://sourceforge.net/projects/loop-aes/
http://www.truecrypt.org/
http://code.google.com/p/cryptsetup/
شرح بالفيديوا
http://www.youtube.com/watch?feature=player_embedded&v=OYE0OsWjd6M