BestCrypt is a disk encryption program
bctool new -a blowfish -s 10M file
Enter password:
Verify password:
bctool format -t ext2 file
Enter password:
mke2fs 1.15, 18-Jul-1999 for EXT2 FS 0.5b, 95/08/09
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
2560 inodes, 10238 blocks
511 blocks (4.99%) reserved for the super user
First data block=1
2 block groups
8192 blocks per group, 8192 fragments per group
1280 inodes per group
Superblock backups stored on blocks: 
8193

Writing inode tables: done 
Writing superblocks and filesystem accounting information: done

bctool mount file /root/crypt/
Enter password:
# df
Filesystem      1k-blocks      Used Available Use% Mounted on
/dev/hda1         3122956     70596   2893720   2% /
/dev/hda2         2917360     24224   2744940   1% /crypto
/root/file           9909        13      9385   0% /root/crypt
======================================================== PPPD
PPDD is similar to BestCrypt, but instead of creating a file, encrypting that
and mounting it, it actually uses a partition which is encrypted and mounted
using the PPDD driver
chown root:root /dev/hda3
#chmod ugo-a /dev/hda3
#ppddinit /dev/ppdd0 /dev/hda3
#ppddsetup -s /dev/ppdd0 /dev/hda3
#mke2fs -b 1024 /dev/ppdd0
#mount /dev/ppdd0 /crypt
======================================================== Guardbot
Guardbot, which password protects www pages
======================================================== StegHide
StegHide hides data in files such as sound and picture files
http://www.stego.com
======================================================== StegFS
Steganographic File System actually hides data on your harddrive
http://ban.joh.cam.ac.uk/~adm36/StegFS
======================================================== OutGuess
OutGuess hides data in image files
http://www.outguess.org
===============	Virtual Filesystem
10 MB size
dd if=/dev/zero of=virtual-disk count=20480
/sbin/mkfs -t ext3 -q virtual-disk
mkdir /mnt/vdisk
mount -o loop=/dev/loop0 virtual-disk /mnt/vdisk
chown user.user /mnt/vdisk

umount /home/user/vdisk
losetup -d /dev/loop0
--------------	File encryption
modprobe loop
modprobe cryptoloop
modprobe aes
dd if=/dev/urandom of=disk-aes count=102400
losetup -e aes /dev/loop1 ./disk-aes
mkfs -t reiserfs /dev/loop1
mount -o loop,encryption=aes,acl ./disk-aes /mnt/vdisk
getfacl /mnt/vdisk/somefile