How-to encrypt disk on nslu2 boxPosted: April 8, 2008
commands in order:
dd if=/dev/urandom of=/share/flash/data/cryptfile bs=1M count=800
define how big the hard drive will be by changing count
losetup -e 1 /dev/loop0 /share/flash/data/cryptfile => give password
mount -t ext3 /dev/loop0 /mnt/loopback/
Another option is to use Truecrtypt on your NSLU2 box. Read more here.