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Crypted CDROMs

Hi all,

I'd like to crypt CDROMs, but can't get it working with ISO9660. Any other
filesystem does work!

What I did:

#> modprobe cryptoloop

#> dd if=/dev/urandom of=/tmp/cryptfile bs=2048 count=333000

#> echo "my_passwort" | \
    losetup -e aes --keybits 256 -p 0 /dev/loop1 /tmp/cryptfile

#> mkisofs -v -r -o /dev/loop1 /home/backup
#> mount -t iso9660 -o ro /dev/loop1 /mnt/cdrom
mount: Falscher Dateisystemtyp, ungültige Optionen, der
       »Superblock« von /dev/loop1 ist beschädigt oder es sind
       zu viele Dateisysteme gemountet

It doesn't recognise the filesystem as a valid ISO9660 filesystem. If I use
ext2 or reiserfs anything is fine.

In my next test I use the loop device again, this time without the chipper:

#> losetup /dev/loop1 /tmp/cryptfile
#> mkisofs -v -r -o /dev/loop1 /home/backup
#> mount -t iso9660 -o ro /dev/loop1 /mnt/cdrom

So what's wrong with ISO9660 on crypted files? Is this a fault of mkisofs,
cryptoapi or the filesystem driver?


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