Cryptographic filesystem implementations #

Multi plateform solution #

T r u e C r y p t http://www.truecrypt.org/
Free open-source disk encryption software for Windows Vista/XP/2000 and Linux

Platform specific solutions #

On NetBSD : cryptographic device driver (CGD)
http://www.netbsd.org/guide/en/chap-cgd.html

see also http://www.onlamp.com/lpt/a/6384 NetBSD's CGD compared to other systems on *BSD et Linux.

On FreeBSD : GEOM Based Disk Encryption (gbde)
http://www.freebsd.org/doc/en/books/handbook/disks-encrypting.html

On OpenBSD : svnd
http://www.backwatcher.org/writing/howtos/obsd-encrypted-filesystem.html

On Linux : Loop-AES
http://www.ibiblio.org/pub/Linux/docs/HOWTO/translations/fr/html-1page/Cryptoloop-HOWTO.html