TrueCrypt

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truecrypt --type normal --size 5G -c truecrypt.tc

Filesystem:
 1) FAT
 2) None
 Select [1]: 2
Hash algorithm:
  1) RIPEMD-160
  2) SHA-1
  3) Whirlpool
  Select [1]: 2
 Encryption algorithm:
  1) AES
  2) Blowfish
  3) CAST5
  4) Serpent
  5) Triple DES
  6) Twofish
  7) AES-Twofish
  8) AES-Twofish-Serpent
  9) Serpent-AES
  10) Serpent-Twofish-AES
  11) Twofish-Serpent
  Select [1]: 1

truecrypt /truecrypt.tc
truecrypt -vl
mkfs.ext2 /dev/mapper/truecrypt0
[ -d /mnt/crypt0 ] || mkdir -p /mnt/crypt0
mount /dev/mapper/truecrypt0 /mnt/crypt0